Budget refusing to pay my deposit

I rented a car with Budget car hire in Cape Town International Airport from 26 to 28 of December 2023, I took an insurance with the car which I was told it covers theft, tyres and window. The service I received was good. I returned the car in the morning of the 28th and they claim that there is a stretch in one of the tyre and it was a urgument cause I did not stretch the car. Anyway the insurance I took covers for it. Now I been I called them on the 29 requesting them to release my funds and was transferred from one agent to another and hold for more than an hour and decided to end the call. Then I send them an email which was only responded to on the 03 of January. I called on the 02 and I was told that they instructed the bank and have to work for 3 days 😒 but still my funds are on hold. I now today they are telling me that they are billing me for the stretch which I took insurance for. What do I have to do to for this company to release my funds, it's 7 days today since I returned their car. I wish the service they give when you take the car can be the same as the one when you return it.