*****ING MONEY - Instalments go off when account has been settled

Really **** bank! First of all, I had 2 car loans with them (3 years in total). When wanting to trade in again, they offered me a MUCH higher interest rate of 13% despite being a loyal customer and not buying cheap cars. My business and personal credit record is also impeccable. So then I go to MINI, apply for their finance and they give me 11% - how the hell do you explain that? It’s a company I’ve never done business with before and I didn’t even have to fight for a better rate! So then MINI settles my account with Wesbank on the 4th of April. Yesterday, 11 April, my instalment goes off!!!! I’m FURIOUS!!! I log into my account, it shows there is still (after the instalment) a balance outstanding!! I sit with the settlement letter and proof of payment, which is exactly the amount on the settlement letter and done on the last day of validity. I email, no response. Actually, EVERY time I’ve emailed the service@… email, no one ever replies. Not even an automated response. So I call and explain. The guy has the audacity to ask me if it went off successfully on my side - EXCUSE ME?!?! How else would I know the instalment went off??? He then says he’ll close the account and put me through to the refunds department to process the refund of my instalment that went off yesterday. I hold another 15 minutes, NO ONE answers. Eventually 28min later, I put the phone down. Are you going to add airtime money to my refund amount??? So 1. I’m waiting for YOUR CALL BACK to process my refund 2. I AM DISGUSTED WITH THE *****S THAT YOU ARE!! I CANNOT BELIEVE YOU ***** PEOPLES MONEY AND THINK YOU’LL JUST GET AWAY WITH IT! IT’S NOT YOUR CLIENTS RESPONSIBILITY TO TELL YOU TO OR HOW TO DO YOUR JOB!!! You have just lost ANOTHER client!