No customer service & debited after settlement

I settled my Vehicle Finance in December and received a paid up letter and telephonic confirmation that my account has been closed yet I was still debited my monthly installment. When calling the contact centre number you wait on hold for over ten minutes and then the line will just cut. I also have been waiting for Natis documents with no update whatsoever. I've never had such bas service from Wesbank before and emails just go unanswered. It's very frustrating that there is noone able to assist.