Remove late payments due to misinformation???

Recently added 2 credit cards to a consolidating agency, and was this was in Aug/Sept. 2010, and was informed by consolidating agency to STOP making payments directly to cc company, they will negociate and sumbit payment through them, as of now pulled credit report and shows 3 months late payment on one card, and 6 months (to date) being late - contacted consolidated company and are preparing letter in our behalf to submit to credit bureaus to hopefully get negative remarks removed, prior to adding cards payments have been timely and non delinuqent, and since on program have been consistent, timely since September 2010?