Internet speed on app Doesn't match plan

I upgraded my plan the other day (3/24/2026) to 1000 mbps.  I have spent 2 days trying to troubleshoot, but the app still says that it is 600mbps, and speed test confirm that that seems to be right. 

I talked to a live agent yesterday (3/25/2026) they said they see that I have 1000 mbps.  They told me to pick up a new gateway since I was having speed problems.  When I picked up the new gateway the person at the store confirmed that they see I should have 1000mbps.  I set up, the new gateway and I'm still seeing the same speed on the app and in speed tests of about 600 mbps.

What are the next steps to actually get the speed that the plan says I should have?