Mweb kings of slow internet service

I'm very disappointed in mweb my name is Brent Baatjies I'm a longtime customer did change to lte for faster internet the first 2 months good speed 20meg line for R729 ,for the last 3 weeks I get 200 plus kbytes, did call in but poor service on the phone and stil this slow speed from mweb I'm disgusted and think about canceling