Does not give feedback. Always has to be called

Misplaced 8ta recharge voucher on 14/2/15. A few days later gave Sne the query and she promised that she would call me the next day because she sent an email to Basil at 8ta. Waited a week and no call. Went to Checkers and she said she hasn't heard from them and would call next day. a week later no call. I went there a few times after and left messages and none were returned. I even spoke to the manager twice about the problem. She then called me on 12/3/15 with a pin number. I tried the pin and it didn't work. called her twice again and left messages....no call back and query not resolved.