Incorrect debited account

Once again Budget insurance can't follow their own rules. I canceled my policy 2 months back and yet they debited my account again! When I called the first time I told the agent to cancel my main policy along with the value added service. I asked if it's done and the agent said yes. This month after the debit went I called again. Asked why my account is being debited and got a stupid answer from the agent. I now have 2 cancelation letters but still I'm being debited.