RCS - LOAN PAID IN FULL 5 WEEKS AGO STILL DEBITED

On the 22 August paid my RCS loan in full inclu the instalment for that month as the per the total given by the agent. I then put a stop order on account at bank as the debit might still run. I contact the call centre department on Monday 28 Aug to confirm if payment was received I was advised it was not as a wrong a ref was used. I then sent through the proof of payment and details as requested i asked that a closing letter be sent to me once done and debit cancelled i was ensured it will be done. On the 25th Sep more then a month later a double deduction of R1139.94 was deducted. I contacted the call centre spoke to Tracy Stober who when i explained the incident was quick to make as if it was my fault then when i explained she gave the whole passive aggressive response. when i asked to speak to a TL was advised there was no one available on site yet? which is very questionable! She could not give me a ref number because RCS don't give ref . She advises that it is RCS fault yes but she will log with Finance dep and get back 2 me. I do not want to be told to wait 10 days i have other debits coming off the 30 Sep and will hold RCS liable fo all charges and return debits