New Nighthawk has 2 mbps on wifi. ugh!!! cant get support, or they hang up on me

I just bought a Netgear CM500 modem and Nighthawk gaming router XR450 (which is not on the list above which is the cherry on top of this nightmare). My desktop, hard wired into the router works fine. 300 mbps.   Nothing else in the house works on wifi. I have 2 mbps. can stream anything, can barely go to a website.  I have waited on line, different times of the day for 5-6 hours at a time, waiting for support to answer. when they do, they say "oh, gaming, sorry I dont do that. hold on." they they put me on hold again, wait so long, it eventually hangs up me. When I finally DO get someone to answer, they hang up halfway through the conversation, I am guessing, because they dont know how to fix this. EVERY TIME I have spoken to someone... and they total times have been about 14 so far, I say "Please write my number down because we WILL be disconnec ted and nbo one ever calls me back". they say "of course, I will call you back within 45 seconds".  Not ONCE did ANYONE call me back. I dont care if you are working from home, so am I. You said you would call me back. It was MY turn after HOURS to get support. There is no excuse for not calling me back. and WTF - why is my model not listed above??? its brand new???