Poor service from the FNB Business section

Can someone at FNB Business explain to me why I have received a letter of demand for the business account that has been frozen from the day I opened it due to proof of residence which could not be verified after sending all the proof I could find. 2 of my clients paid for the services rendered only to find out that it is going to bounce back into that account because my account is frozen due to a lousy proof of residence. I have been calling that the account be closed however no one is willing to help instead the account keeps accumulating charges. Please can someone from FNB please assist and bare in mind that I will not be paying those fees because I NEVER USED THE ACCOUNT!!!!!!!!!