Wrong debit from my account

Don't know, why I even rate them. This people keeps on debiting from my account, though I did sent an email to cancel their policy. How would I pay for two different companies rendering the same service for me???, Everymonth I have to reverse what they debited an that is causing impact for me as other creditors are unable to debit receiving returns transactions because of Auto and General, and please I don't expect to guys to beg me like you always do. I am very satisfied with the insurance company I have joined.