This transaction is not permitted on one of the specified accounts

I keep getting an error "this transaction is not permitted on one of the specified accounts" when i try to transfer money from my savings to my easy account. I called fnb and i was transferred back and forth for over 16 min with no assistance at all. i still cannot access my money and none of the consultants knew anything about the error, this is really unacceptable. If you are going to have a team to assist clients of every possible error at least can they know what they are doing instead of wasting time with zero assistance!