How do I get into my place without having to pay the $100 for a new fob?

With a flipper (et al?) *

I can get a fob to emulate. saved thatr. Truied it. It not work on my front door. I have to go throughb a huge process to get in otherwise. And to pay $100 for a new fob when they can just put the freq on the one I have? High-way Robbery! (the mismanagement MUST be high) So if I have the freq, can i PUT I9T ON MY EXUSTING, OUT OF COMISSION FOB? freqin’ capslock. sorry.
*(“et al” : and others it means.)

Ciao 4 now and plz&thx