FNB What a Nightmare :(

I have a ***** Case against my business account and my account is on hold. I have sent FNB all the necessary documents initial quotation, adjusted quotation, invoice, proof of payment and conversations between myself and complainant. The conversation show clearly that the client whom I know personally has negative intentions against my business. FNB received these and said the case should be resolved shortly the charts have clarified. It ha been 2 weeks now I am calling FNB the agent in charge never answers her phone, I have left numerous messages. I have sent 5 emails with no response. Copied supervisor on my email and no answer no communication it is just quiet and its killing my business operations taking I am still on start up level.