Average 150 mbps down on Gigablast

I’ve been averaging 100-150mbps downloads for months now, even after I upgraded to Gigablast. I’ve contact COX multiple times on the app and been told that my modem (which I own) is responding slowly to their signal. 

I contacted Arris support (at COX suggestion) and they said that my modem’s downstream and upstream power, and signal to noise ratio are out of optimal level. Their conclusion is that COX signal is too weak and needs to be increased. 

So I contact COX tech support again and give them the information from Arris. The tech tells me that the signal looks good in their end and that my modems power snd noise levels are great. Uh... what the heck? 

I asked the tech how the signal could look good when the modems stats aren’t optimal (and I’ve logged into the modem and checked them myself)... and I kid you not... the tech says that COX uses different parameters than the manufacture. Even though the modem I own is approved and authorized by COX to be used with their service. 

I have a service call tomorrow and they tell me that if they determine there is nothing wrong with their signal that I will get charged $75. 

Im so close to cancelling my service. The competitor doesn’t offer comparable speeds but they are half the price for the speeds I’m only getting now.