Bad service

I've opened my Business account at Protea Glen Bank in 2017. When I opened my account it was trading under Fini bake and bakery, after a week or so the name was changed to But M(same account where served for both entities), which I was not aware of, the consultant advised her manager about my situation of changing the account from Fini bake and Bakery to But M civil. The name was changed successfully to But M civil, then 2021 I received an SMS and an e-mail from SARS advising me to settle company returns for the entity that is not trading which is Fini bake and bakery. Due to looting(Protea Glen branch was closed down) I went to another branch which is Horizon bank, I advised them about my situation which was escalated to branch manager and relationship manager, I was assisted by Maria and Thembisile. I went twice to the branch with no help, I had to close down my business to fix their error. We(Thembisile) then communicated via emails this has been going on for 2 months with no response, I was asking them to provide a letter stating that error was done at the bank, for SARS to wipe the money owed to them. Till to date no communication whatsoever my complaint was not dealt with no one is coming back to me. My business is suffering due to compliance, department of labour can't verify my account. I'm now thinking of closing all my accounts with FNB, and I have many. I trusted them with my money, but I guess I was misleading myself. I need them to fix this error I've been suffering for long.