Missouri Dispute Townhouse

I am the lease holder. I responded to an advertised promotion (instant referal bonus $300.00 off your next months rent). The following month I paid $530.00 my rent is $730.00 leaving me with a -$100.00 (credit). Attached to that months rent I advise them that I was taking $200.00 of the $300.00 credit leaving the $100.00 to carry over to October. The month of October I received a letter posted on my door that my rent was delinquent $930.00 w/ no lates fees. I contacted the leasing office & was advise by the manager that I would receive a callback from the assistanct manager. I never received a call back. 5 days later I received a second notice on my door stating that I was still deliniquent $930.00 with late fees. I responded to the letter to the leasing office advising them that I was entitled to my $300.00 off rent so I technically only owed them $630.00. I advised them that the money was in my secure investing account and I was afraid if I paid rent that they would still pursue the eviction. I would leave the money in there until this was resolved. At the office the assistant manager asked me to pay $315.00. I paid the amount 10/19/2008 by money order. Today I received a note on my door stating that they will only give me $150.00 of the referall bonus and also that I was still due 465.00. (they still have made reference to the $315.00 that I paid by money order). I am livid at this point. I have copies of all 3 letters, the advertised promotion, the tenant that moved in under the special promotion testimony, my letter to leasing office, and the money order. What are my chances in court due to their collection attempt of excessive rent, failure to give me the promotion offer, and I have had a peaceful night of sleep since all this began? I am suffering emotionally.

Immediately send them a certified letter asking for their month by month accounting statement. Send them your month by month accounting of how much you paid, when, and how much you should owe them. Ask them to reconcile these differences within 10 days. If they fail to, your only recourse is to take this to small claims court.