Xfinity Mobile Address

I am trying to purchase a new iPhone, however, my Xfinity mobile address is incorrect. It was previously my old address, but now it is updated to an address I don’t live at.  I’ve been to the store and have done numerous chats, with each agent lying that the issue would be resolved.  In addition a ticket was submitted and closed, even though the issue was not properly taken care of. I’m starting to think about switching to another carrier, because comcast cannot handle even the simplest of things.