Service Delivery Failure

I requested that they update my banking details in April 2021. They sent me a form, completed it and emailed back but they still debited my previous bank incurring returned debit order charges which now Standard Bank has handed me over for. Several times I have called and emailed them, requesting that they reverse those returned debits and debit my new banking details but still, nothing. I am beginning to wonder if they really would be able to trace my car if ****** at all. At this stage, I have lost complete confidence in them, infuriated and actually considering another service provider; really.