Unathorised debit dates, not keeping to the contract agreements and no response from Customer Care only quick to respond on leads for loans.

I have an existing loan which is up to date with no delayed payments, I can wait to finish with my payments an terminate the relationship with Capfin. They never keep to the contract agreement, always debiting my account whenever it suits them. I have made calls and send emails to have this corrected but to date no action from them. These unauthorized debit orders are badly affecting my account and credit rating, I regret having had to open this account.