On Air-*****STERS

My contract ended with On Air December 2024. Never missed a single payment but every month I would get texts and emails telling me I was in arrears. I called them to complain. They said to ignore. After contract is paid up, I am still getting debited. Even though they sent me an email confirming account is paid up. I tried calling them. All number on google for On air do not exist. I eventually emailed. After multiple emails I sent to them I was eventually refunded. February 2024 On air tries to debit my account once again. No money in my account so the bank charges me R130 for un unpaid Debit order. The bank says they cannot stop any future Debit orders. I have absolutely no idea how to resolve this. On air is the worst company I have ever dealt with. On reading the reviews I see they have done the exact same thing to multiple people.. I wonder how many people they have done this to who haven't actually noticed. This is ***** and somebody needs to deal with them