PROBLEM WITH CELL PHONE SERVICE

I came into Xfinity Store on May 20, 2025. I was trying to switch from a landline phone service to cell phone service. Price seem better. I purchased Samsung A16 on this day and was informed that it would be 4-7 days to get landline phone number transferred to cell phone. To this day. That has not happened. I went to the store and have called multiple times to have this done but no one seems to know how to do this. Some agents have tried but it has yet to work. I do not understand why this is such a problem. I have been a loyal customer for over 10 years and this is how I am treated. <Edited: Use Good Netiquette>