Unreliable home internet

I am having the same problem, I've had the service for 6 weeks now and it is getting worst by the day B2 or B66, B2 most of the time on my primary signal and N41 all the time on my secondary signal. I have seen users with way worst tower metrics than mine and they're getting 150, 200 upto 300Mbps, I have done the router to computer connection via ethernet to no improvement at all.. if am lucky early mornings i'd get 30-40Mbps but from Noon to Midnight it is just crawling. I call customer service to no help at all.. I might give it a try to some suggestions here and see what happen but any comments are welcome..