No assistance from FNB regarding frozen account

I recently opened a 2nd Fnb cheque account at the Northgate/Jhb branch. I updated all necessary information( lease agreement, physical address, cell number etc.) I activated the card as described and deposited funds into the account. I received the confirmation sms from Fnb that my account is now active. After trying to pay for a purchase a few days later at a Supermarket the transaction was declined 2x. I then tried withdrawing cash from the fnb atm but received a slip showing that the account is frozen. I then called the Fnb call center and was kept waiting in the queue . After spending R 15 worth of airtime my call was cut. I then went into the fnb website and tried to lodge a complaint. I filled out all necessary information but I could not submit my complaint. The system kept on telling me "Please enter a valid cellphone number and do not insert any spaces or special characters" After trying a dozen times I still could not submit my complaint. I am EXTREMELY FRUSTRATED and refuse to waist anymore airtime nor go to the branch again and waist valuable time! I will just leave the situation as is and not use the account or card until someone attends to me! VERY DISAPPOINTING SERVICE!