Car service policy remaining funds not returned

2012 i bough my vehicle polo vivo. The first service was with my own money R999, the service was for 15 000 km. Motorite called me to sell a policy and I agreed to a policy of an amount of R10 144.00 for service of my car. I only agreed to that, i was never told anything else. Car service of 30 000 km's came and it was financed by the motorite policy it costed R1613.10. Car service of 45 000km's came and it was serviced by Motorite policy it costed me R942.00. I called Motorite around May 2015 asking if i cannot pay the outstanding debt on that policy, so that i don't pay interest. To my suprise i was told that the policy was bought by Wesbank. I called Wesbank who finances my car and they told that they bought the policy from Motorite and they have included that R10 144.00 as part of my car installment. I called Motorite they told me my car would be serviced up to 76 000 km's. This means only 2 services ae remaining for my car under this policy. Remaining amount is R7588.9. Surely the 2 services remaing can't be R7588.9. i asked them would i receive a refund if there is amount remaining after 2 services are done? I was given a run around by both companies. Why they dont refund?