status of federal registration of cell phones?

I went to the main Telcel store in Ixtapa 3 times in April '26. However without the name of the woman who I bought the cell phone from in 2016 and with whom the sim card activated, I was SOL. On my third visit Telcel told me there was no choice but to give up my old number for a new one. This was after Telcel told me the woman's first name and that she lived near Acapulco where I have not been near since 2011. Telcel had but would not divulge the last name of the woman I bought the phone and sim card from in 2016. I could not have anticipated in 2016 that Mexico would require registration of all cell phones 10 yrs later.