NO REFUND OF R11 900.25 after a YEAR

NON REFUND OF R11 900.25 after I sold my house last year January. Emailed nearly 200 times, phoned MANY TIMES tried to send attorneys to check up. I am still getting a bill for a year now (and the new owner which is paying) for payment of services ranking up to R16000 + Now they want to give ME over to ITC!!! But THEY owe met R11900.25 and this is a year later. I need somebody to help. Account no. **********