No Refund

I took my car for a service at Hatfield Mazda on the 31 January 2015, and the vehicle was serviced but the Fog lights were not fixed, but my problem now is the person who was assisting me asked me to pay when my car is still under the service plan and I paid R2500,and after paying I asked if my service plan had expired or anything and the guy noticed that he made a mistake I was not supposed to pay and he kept my service book and promised to sort it on Monday which was the 2nd of February, he didn't come back to me and I phone several times without success, I finally went to Mazda on Tuesday and I missed him and he called the following day and say he was working on it, I was the one calling and ask all these days until Monday 16 February he sent an email saying my refund would be paid that day, but nothing happened and I sent him an email on Wednesday the 18th and he said he would follow it up but he never came back to me, today is the 20th and still no response from Mazda and I have not got my refund, I am so disappointed on this kind of service I received form Madza Hatfield