Made the switch to Xfinity mobile and it was a nightmare

I was on a family plan with tmobile since 2006. my brother heard about a promotion with Xfinity mobile about an upgrade. Xfinity agent told us to pay off our devices at tmobile and transfer numbers and get free upgrades and a 12 month free line. she didn’t do the order first for the upgrades. when she ported us in she made the order after and the system kept cancelling the order. they told me to go in store. store employees told me to get lost pretty much. finally decided to leave Xfinity mobile after three weeks of frustration. I lost over 500$ tmobile credits I was receiving. what a horrible experience .