Debiting my account after cancellation

Cancelled my household content insurance in writing with them on 16 May 2019, they continued to debit my account until 1 Sep 2019. I've been asking for a refund since 30 Aug without any joy, they just ignore my emails (2). Phoned them again today, there is nothing on their system for a refund and the new person I had to explain everything to now has to investigate and escalate to his superior. Waiting patiently. I've subsequently cancelled my vehicle insurance also, I would rather not do business with AIG. This all started with a claim of around R1,000 they did not want to pay, they would rather not have my business of R1,300 p/m. My next step is to lodge a formal complaint with the short term insurance ombudsman if this is not resolved by Friday 4 Oct.