USELESS SUPERSONIC

I had an internet contract with supersonic for 2 years, stopped the contract, which were month to month. Then they deducted R2499 from my account, I queried why they did this, they said it was for the router, if I send it to them they will refund me. I sent the router to them with courier guy on 3 January 2024. I sent them proof and they said 21 working days and the money will reflect in my account. Until today I did not recieve any payment. Ive been trying to reach them on their whatsapp platform a 1000 times, but they are always off line or take hours to respond and they expect me to respond within 2 minutes or they close the chat. My account according to them has a credit note of R2499 since 21 April, but no payment has been made. I've been to the Ceres MTN store to ask for help, the were even more useless. We are more than 5 months into the process from 3 Jan 2024. This is shocking service.