Account was debited twice and no credit or refund

I am frustrated and upset at the level of service I received from Supersonic for my WiFi account or billing. My account was debited twice on the 1st of July and 2nd of July with different amounts. I phone to log a complaint and I received a ticket number SST7323 but until to date I still have not received positive response or credit in my account.They keep on saying the second amount is not reflecting on their but they have my proof of the debit order. I have been calling them weekly to follow up but I don’t get any form of communication from their side . The ticket was closed on the 15th and today the 22nd I received an invoice for the month which shows my normal debit amount that I need to pay this month yet there is no credit due back .I phoned again and received another ticket number SST749466 , this was given to me by the lady named Nonhlanhla Ngrma and I asked to speak to her manager , after holding for 5min she said her manager will call me back and her name is Lerato . Until now an hour has passed and I still haven’t received a call from the manager . I am cancelling my contract with these people because I have been unhappy since joining, another issue that I have since joining them is that they registered my account with an incorrect ID number and when I asked them to correct it they said I will have cancel and rejoin with a different account and they will charge me cancellation fees , so I must just leave it . It’s been a nightmare whenever I call them because when I give them my ID they don’t recognise it and I have to explain to different agents that this is what was explained to me