High latency & slow internet

I have been having extremely high latency on my line for the past month now, i am a professional online gamer and cant use the internet due to this. i have logged and phoned numerous times and yet i have recieved response but the issue has not been resolved as yet, a telkom technician came out and said there was either a problem with my modem or my isp(mweb) however i have replaced the modem & i have tried a different isp(afrihost) and still getting high latency so surely the fault is on telkoms side. there are times late at night where the latency is stable at 10ms sometimes even 6ms wich is great but thats at 11 o clock at night and majority of the day its extremly high and cant use the internet because its so slow. i would like this resolved with a matter of urgency please i am paying alot of money for a service i am not recieving! the worst part of this is i log numerous calls only to track on the website that the calls are closed were the issue is still ongoing