BAD SERVICE!!

Good day On 1 June 2020 I paid my car installment twice. I made a typo error with one number. After I noticed I made a mistake I contacted every possible department and I also send through the POP numerous time. After 2 weeks the amount has not been allocated. Nobody gets back to me. I was told my account was handed over to collections (FOR WHAT) Now I get invoiced for arrears in interest. I have had only bad service from Wesbank for 5 years bad service. The only ever helpful person at Wesbank was Adri from Legal PLEASE ALLOCATE THE MONEY. PLEASE TAKE THE INTEREST ON THE AREARS AMOUNT FROM MY ACCOUNT. PLEASE HAVE THE DECENCY TO GET BACK TO ME. Thank you