Frustrating repetitive experiences

I had or possibly still have a policy with B Sure brokers. Despite my attempts to cancel it I might add. I've called through to the call Centre to cancel where the sales agent just wanted to update my policy instead of cancel as I requested. Eventually he notified me it was cancelled. Sadly not, the following month I had yet another debit orde go off. So I blocked it and queried the transaction. This seemed to work. Because since February I have not had any debits go off. But suddenly I've gotten debits off my account again in July for two months. I cannot query or reverse the transaction. And I cannot get hold of anyone at the call Centre. Can just imagine if I needed to make a claim. Stop *****ing my money.