wrong amount credited for rental on credit card - Tempest - car rental - ***

Tempest - car rental - *** OUr rental contract was booked via Vitality for 11-18Dec at George airport.Unfortunately i made a mistake an booked our vehicle at OR Thambo. Mr Trever assited us as we requested two smaller vehicles available then for our two families. He went to the manager and arranged for us to receive a mini bus at a similar price, also notifying us that they dont usually do this but he managed to pull a favour. We were so grateful. We waited patiently for our invoice as the two families should share the cost for renting and maintenance and refueling. To date no invoice. I saw my credit card reconciled with dubble the value end Dec. We phoned in January to enquire re this. Miss Anette Moolman told us its because the values are different from inland rentals. I explained to her what happened and she referred us to Gracia Witbooi. i have to phone her once or twice a week with NO feedback. My last feedback was she managed to reason for a credit note but nothing has happened yet. i also ask for a invoice every time i phone her. Today she said her system is slow she will mail me within minutes. I phone a few hours later with no email yet to hear she has gone home. Is she feeding us empty lies, as she is not confirming authorization of the credit note on mail. She always has the one excuse to the other, i have all my emails as proof of my attempts to communicate with her. Horrible experience. i have now accumulated interest of almost R500 on my credit card as the two families still dont know how to plit the cost and what the final cost value is. this is ******** to take money for service with a different agreement amount. its ******** to not provide invoices for the value taken.