Xfinity mobile issues

I have 2 mobile lines on my account. One of the lines recently needed a replacement which I received from assurion but can’t activate. I was told to contact Xfinity so I went to the store and they couldn’t do anything. Went thru 4 chats n still no resolve. Then I reached a rep who suggested I add a phone line and then wait for the number to transfer over something they said would be done within 5days. Apparently that’s a whole pile of [Edited:  “Profanity”] so now I’m stuck paying 3 lines. I’m done with XMo this is ridiculous