Switched from X2 to 2 Gig Plan - Upload Speed Cut in Half

We exceeded our data limit this month, so I asked about adding unlimited data to our plan. They suggested we switch from our old X2 plan to the new 2 Gig plan, and assured me that our internet speed would stay the same and still work with our equipment. They never told me our upload speed would be cut in half. I let them make the switch yesterday. We were consistently getting around 350 Mbps upload speeds, and after changing plans it seems to be capped at around 150. I spent hours on the phone yesterday with the loyalty team, advanced tech support, etc. and they either play dumb, tell me we're getting the fastest speed they offer (not true based on our speed test history), that it could be our equipment (not true, as we were getting twice the upload speed on this same Netgear CM2050V modem until yesterday), or pretend they're tweaking something to "fix" it without ever fixing it. The last one I talked to yesterday said he was going to look into it further and send me a text within 2 hours asking if it's resolved. I'm still waiting for that text a day later. The cherry on top is our bill went up because this is "the best they can do" as far as discounts. Frontier just ran fiber in our neighborhood, so we will have another option soon. Never considered switching until now.