INSUFFICIENT FUND CLAIMS BY POS.

I sent certain amount of money from my Access bank account to my Keystone account from my phone around 1am in the morning to make up the money I had in my keystone account, expecting to withdraw the money in my keystone account through POS in the morning after day break but to my surprise when the POS machine declined saying insufficient fund. I tried to reduce the amount I was intending to collect but the same insufficient fund was the reply. Then I had to check my account and discovered that there was nothing at all in the same account I had transferred money into earlier that morning. With the print out from the POS I went to my keystone bank to lodge in my complain at the costumer care desk but to my dismay the attendant refused to give me my account details and but promised me that she will work on it. After two weeks I went back demanding the release of my statement of account because my money was yet unrecovered but she still insisted that I don't need any account details that she is working on it. It's been almost two months now that money has not been recovered and returned to me. What do I do?