Questionable business practices

It has been 20 days since I moved out and still my file has not been finalized. Communication comes in drip and drops and there has been some questionable practices. They first charged me R500 and said it is for late check out even though in the confirmation email that they sent to me, they stated that my vacate date is 31 March 2026 and I can move out anytime. When I queried how did they determine that because it is more than what I would have incurred had I stayed an extra day and how is it late check out when I paid for the 31 March 2026, they said it is at their discretion. They made mistakes on my account resulting in it appearing as though I owe them and spent days refusing to talk to me or fix it till I wrote my complain on hello peter and that is when they only reached out and i helped them see their error. Then they decided they are going to change the interest earned on deposit because it has now come to their attention that for all 7 years the interest rate they used was higher than they wanted to give. Now instead of closing the file they come with another story. There were 2 existing tiny spots in the bedroom carpets that I found, I assumed it was just stains now they say it burn marks and they will be replacing the carpet at my cost but there are no figures attached so I still have to wait longer to get the file closed. Very bad service