AIG Car Insurance bad customer service

I signed up with AIG insurance in August 2018 for vehicle cover. An incorrect vehicle description code was use by AIG. The incorrect code was picked up by BMW and they were advised to rectify and charge me correctly. They are charging me R173.21 extra per month since August 2018. I have made numerous phone calls and emails for a refund which were in vain. I contacted AIG on 16 August 2019 and the consultant Thabang said he escalated my query over a month ago and Finance has not come back to him. I am appalled that he is telling me about all that is happening within AIG which is none of my concern and what is of importance is that I am refunded for every extra amount that was deducted from my account to date.

He has promised me feedback before end of business yesterday and it did not happen.

It's unacceptable that these companies are quick to take consumer's hard earned money and when they have to do the right thing for them it is a mission.