Suddenly slow home internet.

Just an update on my issues. I contacted them again after getting a dirty, stinky, used replacement gateway that in no way is going to fix the congestion on their network and finally got a support person that seems to actually know more than what their scripts tell them. He said engineers are looking into it, and has given me some updates, but as soon as I told him that I'm using Verizon until this is fixed, all the updates stopped. Verizon's 5G, at least for me, is slower (around 120Mbps vs T-Mobile's 300-500Mbps), but I haven't had a single outage. Every evening I check my phone, which is T-Mobile, to see if maybe things seem stable, and I often get around 5-10Mbps instead of the 500+Mbps during other times of the day. I was really hoping T-Mobile would get their issues fixed, but the longer this goes on, the less I trust them to have a stable network, so I might just completely switch over to Verizon (including phone) since I think I can get phone and internet there cheaper than T-Mobile.