Policy cancellation

Good day;

I have been struggling to effect changes to the policy for the past two weeks with this insurer. I called the call Centre 3 times and being transferred to different individuals and subsequently being promised to be called back as they didn't have any available agent to attend to my request. Until today I didn't receive any call from them.

This is unprofessional and I was suppose to just cancel one vehicle that we sold but I am considering cancelling the whole policy.