A month past and still NO Refund due to me

I have a car service plan with Innovation group and when my car was taken in for the 60 000km service, I paid cash for the service. I proccessed a claim for a refund on the 30 November 2015 and i have been given the run around ever since. I have been referred from one person to another. What was said to have been resolved within 7-14 working days has taken 18 days and it doesn't seem as though it will be resolved anytime soon. Never have I had to fight and so hard and make numerous calls, being placed on hold only to be given empty promises. I'm highly disappointed in the service i have received from them