They can program it, but they won't disable it.
If you have an "old" key that is currently programmed into PATS, there is a way around it.
Just remove the antenna ring from around the cylinder, zip tie the programmed key to the ring, then stuff the key and ring waaaaay up under the dash. PATS is happy and, if you never tell anyone, you're as secure as any non-PATS vehicle that uses just a mechanical key.
Ah, crap, never mind. I read closer and see you don't have a good key. Call a tow truck or a mobile locksmith who has the right equipment.
If your original owner's manual is missing, download a soft copy from www.fleet.ford.com
under the PARTS AND SERVICE tab.
1995 Mustang GT Convertible, only 68K miles.
2000 Ford Contour Daily drive.
2001 F250 SD, 6.8L, 4 X4.
2007 Mercury Mariner AWD - Wifey's daily driver