bank account frozen because proof of res went missing in the account's profile

I opened an account at the bank with my ID and my proof of address, suddenly seven months down the line my account profile no longer has my proof of address linked to it, it was deleted and as a result my account was frozen. this was done to the banks staff wrong doing and it negatively affects me. the strange thing about it is that I have other accounts but they decided to delete the proof of residence from the account where I transact. to top it off I receive in the mail a bizlaunch account with my address *****luntly used. informing the bank and nothing was done about it.