Unauthorised debiting of my account

In April I discovered that FNB brokers have been debiting my account for 10 months after I had canceled the car insurance. I contacted them and after numerous efforts I was told a refund was going to be paid out. When paid, the refund was 30% of what was owed to me. I escalated the matter and still I was given the run around by the manager of the section. I lodged a complaint with FNB online and was told I would be contacted but nothing happed. Two weeks later, my money has not been refunded and to further aggravate the situation, they still debited my account this month. This is rather frustrating and after been such a loyal; customer having only used FNB as my main bank, the service I am received is abysmal.