Perfect download really low upload

I have been having upload issues for months now and have not had steady upload speeds since i upgraded my service. The package i have is 300/30 and the actual speeds sit around 325-300 download to 5-7 upload speeds on speedofme.com the speeds tested on ookla have been false always showing 300/25 upload when its really not. I've had about 5 techs within 3 months saying its a tap issue and schedule maintenance to fix the problem and give it 24-72 hrs to be fixed. As always my upload speed goes up for a day and goes up to 25-30 and then crashes down to 5-7 until i schedule another  tech to get it up to the advertised speeds. We have switched modems,tested on other pc's the results come out also to add i never go over the data cap and tested modem for packet loss came up clean.Im thinking my upload speeds are getting throttled i never get a straight answer from a tech or a rep very frustrating. 


Speed history over the week.