Cheated out of phone trade in value

Samething happened to me today on 4/12/22.I was on Sprint for years over 15 to be exact and was eligible on 3 different lines for upgrades with an $800 credit for each 3 lines.So I was told over the phone on Sprint that I could get the same deal instore,online or over the phone.So today I went instore to get the $800 credit towards an S22 Ultra which I was told was in stock prior to me getting there.I simply told them 1 of the 3 lines I had put in a request to close out.So store moves me over from Sprint to TMobile then told me if I wanted to get the $800 credits I'd have to keep the 3rd line on other then that they could only give me a $400 credit towards upgrade.I told them to reverse me back to Sprint and now they're saying that can not be done. I'm so disappointed with the whole process I'm thinking about eliminating another one of my phone lines or possibly going to another carrier all together.All of my phones are paid off so it would be nothing for me to leave.1 of the only reasons I was upgrading from my Note 8 Plus because it was basically out of Network and Sprint/TMobile is basically forcing customers to upgrade yes a force upgrade not an optional upgrade with the 5G crap.I may have to consider another carrier. I'm coming into Tmobile already unhappy and like the other person on here stated that was cheated out their trade in value upgrade Im with them as well when they said they could see class action lawsuit.If you're on Sprint which is better service do not fall for the merge over to tmobile stay put on Sprint until Sprint moves you so you wont loose your Sprint incentives which are way better.Hpw the hell Tmobile going to own Sprint but wint honor the Sprint incentives? My incentives from Sprint should have bern grandfathered to Tmobile SMDH