homeloans poor service

I cancelled my buildings insurance in September 2018. I requested the home loans department not to debit me for the insurance part as it was cancelled. I've called the home loans and insurance department on many occations to have the insurance part credited to me. It has now been two weeks, many calls, emails, speaking to 4 different advisor and a manager with no luck,no proper feedback or any money. I want someone to sort this matter out