Supersonic Horrible Service

I've 5G subscription with Supersonic and the past 5 to 6 months I have been paying for a service that got interrupted most of the time, I've logged so many support calls and they can't seen to stabilise my connection. Last month they deducted more than what was agreed on in terms of monthly premium, when I contacted them I was told it was a technical glitch and I will only get my money after 7 to 21 days because it their company policy. I guess it policy to deduct more money from their customers.