Unauthorized Debit

Good Day, I'm very pissed with Mobimoola. They called me a few years ago regarding their small loans. I agreed to take the loan but never used their money. I decided to cancel few days after I took the loan and they debited my money for the full amount that month. I called them to complain and asked them to stop debiting even wrote a cancellation letter and emailed to them they stopped for a while and started again after cancelling again in writing they stopped and started again now 30 Jan 2016. Please I'm begging you stop debiting my account coz now I want to contact my lawyer to help me. Just stop robbing people I want my money back imagine 2 debits