WORST SERVICE EVER !!

i recently switched from a an old cell service provider which i had no problems with, just that my dad didn’t feel like paying that much anymore. So we switched from t-mobile to this. I got a new number due to personal reasons and my data has not worked since. Anytime i called the 800 number i was on the phone for hours talking to people and they could not fix the issue. Gave them a couple days and called back. It’s been 2 weeks now without being able to use my phone outside of my house or an area with wifi. They sent a new sim card and set it up for me, and it still didn’t work. I was then told that they would connect me to verizon (they use the same cell towers) and was told i’d receive a call back in around 30 mins. NEVER GOT THE CALL BACK! i am absolutely disgusted with the type of “service” they tell us that they provide. I can’t switch since i’m not the primary acct holder. but why can you not fix this problem. I’ve never had this issue with anyone but xfinity. it’s very annoying and time consuming to keep calling and calling and nothing is getting fixed.