MOTORVAPS - WORST SERVICE PLAN

I've had the worst service with Motorvaps. I took a service plan policy out with them in Jan 2019, and booked my car in for a service in June. My car is still under warranty. I took it Renault Wonderwaters, and everything went well. I booked the car in last week to be serviced today, and I got a call that my claim has been declined because I shouldn't have taken my car to Renault. When I asked why my previous claim was accepted, they said it was a MISTAKE. Had they told me I can't take it to Renault, I wouldn't have taken the policy, because my car is still under warranty. After all those installments, all they can say to me is 'sorry' but that's not all, they still want R1000 cancelation fee!