A judgement has been placed on my credit report without my knowledge

A judgement has been placed on my credit report without my knowledge. I have contacted the apartment complex to whom placed this judgement. I went to the court house I was informed to contact the apt complex. I spoke to the manager, she informed me that she would contact the property manager and take care of the issue, that was back in april 2008 I have tried contacting her on several occasions and have left numerous of messeges no return call. In June 2008 I sent her a certified letter statin my concern, she signed the return receipt card verfiying that she received the letter, I still havent heard back from her. I in the process of trying to buy me a house What shall I do?
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drive them crazy
did you not fullfill the entire lease
then move some where this is the only reason i can think of that you would not recieve summons
and have judgment rendered without your knowledge
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http://www.oskie.com/free-credit-help-sample-form-letter-letters.htm

legally dispute and validate this judgment
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