City property is a ****. They are taking advantage of their tenents

I have a problem with city property Sharon's place flat regarding my deposit. I sent them several messages with no lucck. I was promised to be given my deposit and the money of the remaining days that we didn't stay in the flat due to us moving out 5 days before month end due to lockdown. But to my surprise the culculations of the deposit statement doesn't make sense. The deposit was not all we paid for cleaning Matt's which on their list is R500 and they deducted more than what they were to supposed to deduct. When I cammunicate with them on their WhatsApp they didn't help. When I asked about the money they said they paid for repairs that's we don't know, and when I ask why they deducted from deposit and the money from the remaining days they stopped communicating with me. I don't understand why they are doing this to us. Please help