Bad service provider

Their wifi is always buffering and now the modem is faulty, on Monday I was told a technician would call me back but they didn't, Tuesday I got told a new modem would be delivered, 4 days later no one has called and no modem has been delivered, each time I call customer service I get told someone will call back, I have been left with no wifi to work the entire week and have had to buy data daily to work which is expensive and supersonic won't compensate, they just don't care. I would not recommend supersonic mtn!!!!