Terrible service and reception/ speeds from Webafrica.

I used Webafrica for around two years with no problems and great service. However, when the non delivery started it all went downhill. My 10mb line dropped to .0.3mb and it was impossible to get anything done. I logged a call, when they called me back my service ran at 40mbps all of a sudden. Half an hour later I was back on 0.3mb. I logged another call and they called me back the next day. Again while on the phone with them my speed shot through the roof. They told me that I am getting better speeds than what I'm paying for. Half an hour after the call, nothing. No connection at all. I cancelled the service and stopped payment the month after that. I'm now being told that legal action will be taken if I don't pay for another month (Where I had no connection at all). All this for R700 odd rand. I was planning to just pay the couple of rand and send them on their merry way to never return, but the principle is that they give bad service, accuse customers falsely of getting more than you pay for...and then still want to charge for a month that I had no service? Am i the only one being *****ed or is this how they operate in general?