****mers don't do it

I took up supersonic a day after connection it was not working and I requested a cancelation in early August 2023,i was told I need to put a month notice. So end of September 2023 they would call me to fetch the wifi. Now when I call for them to fetch I am told I need to pay and they keep sending me invoices and try to debit my account. When you call the call center you are told yes it's canceled but they keep trying to debit my account