Failure to assist me with my queries

I have a contract with Liquid Capital which I took in April 2018 for my car, on Monday I called Liquid Capital since my car was due for service, I wanted to explain that I was involved in an accident so that they are aware if I don't bring my car in, the repairs are scheduled for the 8th April and the service is due around that time, I was assisted by a consultant called Palesa who was so helpful and patient, she told me that I have a debit order which did not go through, and she advised that she will transfer me through to collections to sort the issue first before she can assist me,i was transferred to Lesego who told me how much I owe but I was not sure how did that happened that, she gave me banking details and told me that she will put me back to the consultants to update my banking details, for a while she acknowledged that Liquid Capital made a mistake as FNB called them to switch my account from STD BANK to FNB, so I incurred cost unnecessary, I called her again yesterday but was told she is not available, I called her again this morning regarding payment of bank charges, she said she will call me but she was gone for ever, I am not happy about the service I received and the fact that they take ownership of the error but not taking responsibility to fix the problem. Lesego is not professional at all, she does not put customers first.