Cannot order phone for 4th line

I just switched to T-mobile and have a 4 line plan. I was able to order 3 phones in the store during the switch (they didn’t have much in stock so they had to ship our phones). When attempting to order the 4th line, I was given an error stating I was not authorized to make this purchase. Thinking it was my bank flagging these purchases as fraud, I tried to use multiple different cards with the same issue. The team member was at a loss and called multiple departments who all told him the couldn’t help. I was eventually sent on my way saying “try again in 24 hours”. So I did… and got the same message. I called the 1-800 number I was prompted to on the error message and the customer service rep was unable to solve the issue and told me to wait 24 hours. So I did… I reattempted the next day and again got the same error message. I went back to a store where the associate told me there was nothing they can do in store, I had to call customer service. I called customer service and they told me there was nothing they can do and to go into the store. It’s been several days, I have a phone line I’m being charged for with no phone connected to it, and the only answer I can get is to wait 24hrs. My only hope is someone on reddit has faced this and can provide some help. I’m at a loss and apparently so is T-mobile…