Supersonic atrocious service

For the last 6 weeks, I've been struggling with my internet download speed, every single night between 19h00 and 23h00. I've spent over a R1000's worth of airtime phoning after Supersonic, sending messages in facebook with only a quarter of them being answered. I am sick and tyre, fed-up with this **** service from Supersonic. They just display incompetence in solving this issue. I am paying my end of the deal each month, but no more. I won't pay a cent u less they fix this service or else I will just have to cancel and sit without internet while waiting for fibre in my area.