Major Issues!

I have chatted in 30 PLUS TIMES, WITH PROBLEMS STILL LOOMING. I upgraded from 400mbps to 1000mbps. After a "WEEK", I finally see im on the right plan, im getting the speed to my router, but its only outputting 600-700mbps to my device. Thinking im need a simple re-provision done on the router with correct plan speed? Please Advise