Frozen checking account

In 02/2009 a judgement was filed on me and on 08/2009 it shows cost paid, case closed. Not sure what that means. I never received word of date or time of court, only that a judgement was filed against me and they won. On 11/23/12 received a letter with a confirmation of receipt my son signed and it was to me and my bank. When I checked my bank account it had been overdrawn for over $3200., This is supposely a summons but no court has signed this and it states I have or my bank has 30 no more than 45 days to respond or a judment will be rendered against me for the amount the plainfiff clamis due by the defendant. I don't know what to do.