Supersonic/MTN

I had to cancel my first order with MTN/Supersonic as they never showed up for the installation. Second time around they actually came out, part of the order process they confirmed my bank details and debit date. This was mentioned 3 times, the 15th of every month. They tried to debit me on the 3rd, 8th and possibly 1st of the month. When I query this they tell me I should change my banking details on the app. When I attempt this it declines the change. ***!!! It is now 6 weeks, still waiting for someone to call me back. MTN/SUPERSONIC if you are out there why mess with your customers like this? We choose you out of many carriers. Poor service in general. when you phone you stay on hold for 15mins at a time.