Incorrect billing

I owned a unit at kidbrook complex where proximity is a managing agent,when i requested for a levy statement i was forwarded a levy statement with a high amounts of levies owed ,when i Enquire about it with Gerda du toit she/he told me that according to their records i was liable to pay because my tenant had damaged the gate and i havent been paying levies,i then sent her /him proof of payment and my rental agent also sent her/him proof of payments for the levies paid from 10/2014 to 02/2015,after selling my unit an amount of 10900 was deducted form my proceeds and the reason was because of levies and damage to property owed,the damage to property was 3200 according to the invoice sent to me by the trustees and i didnt owe any levies ,when i emailed Gerda again to ask her why were my levies so high even after sending proof of payments she still ignored my emails,yesterday i sent her another email asking about the revised statement she still sent me an incorrect statement with monies owing even after i forwarded proof of payment .The only amount i was aware of that was suppose to be debited its 3200 for the gate the rest is incorrectly calculated .