Miway paid the wrong Car model. Now I have a shortfall ? how

On the 30 th July my car was involve in a car accident and MiWay service was good until they paid the claim September and I was left with a shortfall of R17 350, fortunately I have shortfall policy with IUA Business Solutions. When I claimed the shortfall they realized that MiWay paid for Ambient and my car was 2020 Ford Figo Trend. So they emailed them asking them to re-calculate and pay correct amount but they don’t respond. They must inform UIA if they are not willing to re-calculate, they should know what to do. Now they are frustrating me with their attitude. Today speaking with them, they told me that yesterday they sent an email to MiWay again but still no respond. My problem now is that the shortfall money the bank will add interest every month. And the car will still in my name. I shouldn't be owing anything to the bank at this moment.