Virgin Mobile VAP continues

I have been debited a small amount each month, for years, for an undisclosed product. Every time I have called I have been told I must contact someone else. I suspect its phone insurance from 5 years ago that I unfortunately agreed to. I have tried mutiple times to cancel it over the last 3 years but no one can give me answers. They claim its a third party but it still registers as a Virgin Mobile Value Added Product (VIRGINMVAP ********** 71 MAR PREM) and keeps siphoning off R93 each month.