Account Settlement

had an RCS personal loan which I settled in full in August 2015 (17 Aug) after asking for settlement letter. for 2 months nothing went off my account which confirms the account was settled. only to find out at the end of Oct they deducted R1500.00 via debit order. I contacted the call centre which then transferred me to accounts , this lady put me on hold for more than 15 minutes so she can verify my settlement, only to be disconnected. I send them an email, no responds received as of yet. this morning I received an sms stating if I don't pay they will hand me over. I have the proof of settlement I paid on the 17 August but they still refuse to accept it stating their records shows I only ask for settlement amount but never paid it, so how did R36213 go out of my account to RCS account with full references, but you are unable to see it. This is very poor service & the lack of support from call centre is just .... The lady in accounts is not even willing to receive the settlement letter from my bank. I now received a email from the attorney's of RCS & even they are not willing to assist, telling me I must contact RCS for settlements.