Innovation Group (Renault Vereeniging) Charged twice for service

I took my car for service at Renault Vereeniging and before I could take it in, I asked the dealership about my service plan and I was told I don't have, it ended on 45km.

I was so confused but because the car was booked I had to take it. After service I then enquired about the service plan because I knew I had it. The innovation refunded me but they refuse to pay the full amount that I paid and I feel that this is not my fault. Someone at the dealership didn't do their job to check the service plan with Innovation group.

I am not happy and requesting my refund in full.