Poor internet, Speeds and Service

Service level is not consistent. I was assisted approx 6months ago but now I'm back to square one...still waiting a response after logging 2 tickets. It seems I constantly get throttled in the evenings and weekends even after upgrading my line. I was suppose to have a 15mb line for my usage but I'm forced to use a 50mb line because of this but still doesn't work...utter ridiculous