Supersonic bad service

This is the worst internet provider i have ever came apon. Slow to respond, slow speed and the towers are alway having a problem. I need to speak to a supervisor but they never respond. In the 2.5 months i have been with them of which the last month i payed i have gone over to another proveder and i wasted R 899 and i had to pay another provider just so that i can have internet. Suddenly my sim is faulty and i must pay R250 to have a new sim delivered. I think that is bull. Worst of all is if i cancel before 6 monthes i have to pay R600 and send my router back on my expence. The WORST is that most of the time had less than 1MB/S or there were no service. I need some person in the compony to contact me.