Account been placed on hold

My account has been place on hold for a ***** investigation. They send me a email about 2 months back,asking me for prove of payments that has been made to my account,I did sent them everything that I have almost 2 month ago and did not get any response from them , I have tried to contact the number on the email but keeps on telling me operator unavailable My salary gets payed to my account and I really need my account open because there are debit orders that needs to go off and staff that needs to het payed but fnb doesn't even let their clients know what is going on . They said bout 10 to 15 work days its been almost 30 to 40 work days what can I do