Is there any help in getting rid of an LVNV Funding entry?

This is a complex problem that requires some serious help. If someone can provide that I would surely appreciate it. The problem is as follows:

On 10-19-09 I received a copy of my credit report. I noticed an entry identified as LFNV Funding LLC, with an address listed as P.O. Box 740281, Houston, TX 77274. Since the name and the amount they stated that I owed was unfamiliar to me, I wrote them a letter, dated 11/06/09, a copy of which is included in italics, and mailed to them via certified mail (using the address they listed on the credit report) The letter was returned, marked ATTEMPTED NOT KNOWN and also RETURN TO SENDER NO SUCH ADDRESS.
Essentially, this company lied in order to avoid being required to validate the debt they said I owed. The address that was used is the same address that was provided on the credit report. Further investigation recently indicates that this same address is also one of the companies associated with or owned by LVNV Funding, LLC. My questions are:
1) Can the unopened , certified letter serve as adequate proof and notice to validate the debt?
2) What legal remedies are available to me since they lied and refused to accept mail?
3) Can they be legally required to remove the entry from my credit report since they used deception to avoid being contacted?
4) What legal remedies are available to me since they have repeatedly contacted my spouse’s place of employment and made threats?

LVNV Funding LLC P.O. Box 740281 Houston, TX 77274
To Whom It May Concern:
Be advised that this letter is a notice sent pursuant to the Fair Debt Collection Practices Act, 15 USC 1692g Sec. 809 (b) that your claim reflected in our credit report is disputed and validation is requested.
This is NOT a request for “verification” or proof of my mailing address, but a request for VALIDATION made pursuant to the above named Title and Section. We respectfully request that your offices provide us with competent evidence that we have any legal obligation to pay you.
Please provide us with the following:
What the money you say we owe is for;
• Explain and show how you calculated what you say we owe;
• Provide us with copies of any papers that show we agreed to pay what you say we owe;
• Provide a verification or copy of any judgment if applicable;
• Identify the original creditor;
• Prove the Statute of Limitations has not expired on this account
• Show us that you are licensed to collect in our state
• Provide us with your license numbers and Registered Agent
These questions should be answered also .
Who is the current owner of this alleged debt?
Who is the original creditor for this alleged debt?
If LVNV, LLC is the current owner, when was it purchased?
Who was it purchased from?
Have you assigned the alleged debt to another entity for collection?
If so, who?
If LVNV, LLC has sold or otherwise transferred this alleged debt, to whom was it sold and when.

At this time we will also inform you that your offices have reported invalidated information to any of the 3 major Credit Bureau’s (Equifax, Experian or TransUnion) this action might constitute fraud under both Federal and State Laws. Due to this fact, negative marks found on any of our credit reports by your company or the company that you represent are being reviewed and seriously being considered for bringing legal action against you for the following:
o Violation of the Fair Credit Reporting Act
o Violation of the Fair Debt Collection Practices Act
o Defamation of Character
If your offices are able to provide the proper documentation as requested in the following Declaration, it will require at least 30 days to investigate this information and during such time all collection activity must cease and desist.
Also during this validation period, if any action is taken which could be considered detrimental to any of our credit reports, we will vigorously consult with legal counsel for suit. This includes any listing any information to a credit reporting repository that could be inaccurate or invalidated or verifying an account as accurate when in fact there is no provided proof that it is.
If your offices fail to respond to this validation request within 30 days from the date of your receipt, all references to this account must be deleted and completely removed from our credit file and a copy of such deletion request shall be sent to us immediately.
We would also like to request, in writing, that no telephone contact be made by your offices to our home or to our place of employment. If your offices attempt telephone communication with us, including but not limited to computer generated calls and calls or correspondence sent to or with any third parties, it will be considered harassment and we will have no choice but to file suit. All future communications with me MUST be done in writing and sent to the address noted in this letter by U.S. Postal Service.
This is an attempt to correct your records, any information obtained shall be used for that purpose.
Very truly yours,
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