Bad service

Have been using fnb for 5 years now My account was frozen last year cause of a report between me and my client and spoke to their representative at ***** department and also my client that they do refund him back from my account and open my account but since then when ever I call they tell me the person that's handling the case is either not there or has been changed and they will get back to me yet the client is still waiting for their refund and I'm also waiting for them to unfreeze my account but I can't get assistance my client has been calling wanting her refund and saying there no case but fnb has unfrozen my account as of yet