WONT REFUND PROPER AMOUNT

i rented a car from first car rental from the 2nd of may until the 5th. They gave me a rate of R952. I was a bit confused as to why i was getting a 4 day rate instead of a 3 day rate. The trainee at Cape town branch explained that i was getting a special weekend rate. Approximately 3 days after i dropped the car off i received an invoice that stated they were deducting R 1101 not R952. I called the call centre numerous times and they refused to help because they said that is what they have on their side. I HAVE THE INVOICE THAT STATES YOU CHARGED ME R 952!!!! Eventually i spoke to someone at the branch and she said she would email me and i should reply by attaching my invoice so they can further investigate the situation. Its been 2 days and still no email. FIRST CAR RENTALS SERVICE IS DISGUSTING. THEY REFUSE TO TALK TO ME OR EVEN HELP ME. I WANT MY R 149 OWED TO ME BECAUSE YOU GUYS ARE *******!!!! How can a company be so ok with taking money from someone. I recommend everyone to NOT use first car rental. Can first car rental not see ALL the complaints on hellopeter. YOU NEED TO CHANGE SOMETHING BECAUSE PEOPLE ARE VERY UNHAPPY WITH YOUR SERVICE!!!