Super bad call centre!!!

I took out a car insurance policy at King Price, but before the first instalment decided to rather keep the car on my father's insurance due to the high financial cost of our new baby. I requested via email that my policy be cancelled seeing I could not afford the insurance. The call centre phoned and after I explained they promised that they will pay back my money because the insurance did go off after my email. The guy said that they would phone me once again to confirm the cancellation. They phoned and I missed the call. They then sent me a sms asking when they can phone again. I rep**** with a time that I know my baby will be sleeping and I will be able to talk. They did not phone when I requested, but rather at more difficult times. I received and rep**** to the sms three times and they have not contacted me again. It is almost two months after I requested a cancellation and they promised my money back. What must I do for that to finally happen?!