refund not processed - poor customer service

Two extra charges, a deposit of R4000 and a fuel deposit of R1500 were mistakenly paid for by me using a a standard bank cheque card, this happened at 12:45 25 June 2015. These charges should have been put through on a VISA credit card and this was done after I was promised a refund on the Standard bank cheque card. Lucille rang the bank personally and told me that the refund would be processed within 24 hours. As of today the 30th of June I have received no refund - having checked with the bank. Today I have rung Lucielle at the King Shaka office ***) three times. On each occasion I was told Lucielle was in the car park but I was promised that she would ring me back immediately. I have received no call back. I would appreciate this to be resolved as soon as possible.