Empty promises from C-Fibre with poor customer support

The promises by Cell C C-Fibre that their symmetrical connection is unshaped and unthrottled seem to be false. I've been with them for more than a year and when I joined I enjoyed perfect connection but a year down the line and I can barely open a webpage sometimes other times a small download takes forever. My PC has been connected directly to the router as well as the CPE but still the connection is intermittent. I've tried calling and the only help I get is to reset my router or CPE everytime. It takes weeks for support to respond to emails or call back, if they do. Although support did try calling once while I was unreachable and basically never tried again after I told them when the opportune time to call would be but no word from them since, they didn't even leave a voicemail.