Even if you unplug the router when Verizon tech support says they are going to run a test on it, they will say everything looks good and is running perfectly anyways.

Also, a tip. They will also try to sell you their newest router. Say you have that one already in every room and the speed is even lower than it was before, and then demand a refund because they sold you defective product. 9 times out of 10 they will unthrottle you instantly.