Bad service and no feedback

I change my banks. FNB tried to change the debit order. No response. I tried 12 times now no response. They send me an sms that my account is dormant. When I called them they said it is still active. They also said that my device warranty has expired. On my account it show lifetime warranty. I asked them to test my device. They said that they will do it and send me an e-mail which did not happened. I send an e-mail again. Then a lady called me and said it was tested and working, but on my account it show that it was not tested for a long time. If they cannot do the basic things how would they be able to find my vehicle when it is ******