Customer Service flat out lied to me about promotions

I wanted to do something really simple and make a new account under a released phone line. The customer service rep who helped me was very nice at the time and helped me make a new account for this line. I was also trying to take advantage of a promotion for 800 dollars off a new Samsung S23+ since i was opening a new account. I asked the representative if this would affect my coverage since I was switching plans and getting a new phone. The rep Promised me it would not and i could at any time switch between phones if i liked. I asked multiple times if the new phone would still be the same phone number and Fred the rep said it would. I'm thinking to myself that T-mobile actually honors their word. I find an E-mail today thanking me for opening a third line. I thought that was weird and called customer service. Apparently the promotion was for opening a NEW phone number. Of course I was frustrated  after spending 6 Hours (8 at the time of writing this) to get my problems resolved. I went through 8 people now (Janica-Supervisor - 602-854-109) (Fred - 846-768-92) (Whitney J- 2466) (Idaesha - Supervisor) ( Alysha-Supervisor) (Kerry) (Derrick) All of which refused to help me, The three Whitney Idaesha, And Alysha were also very rude to me and gave me nothing but attitude and tried to talk over me. All I want is to get what was promised (And PAID FOR) to me. Every single one of them basically told me I was out of luck and there was nothing they will do for me to resolve this situation.

I just want my number on a line and the phone/watch that was promised to me. Why is T-Mobile opening more phone lines for me? This is not how a customer should be treated. T-mobile needs to make this right. There's no reason A customer should spend a whole working day figuring out why there's extra charges on an account.