Anti-theft Devices problems of the 1998 Ford Expedition

Went to store, came out battery dead, car wouldn't start. Had not left lights or any accessories on. Got a jump, drove to auto parts store. They checked alternator and battery and said battery dead, needed an overnight charge. Let them charge battery, put back in car, horn started blowing and would not stop despite my using both the key and key fob. Horn blew for 5 hours before I found out how to disconnect from google. Got horn to stop, and car wouldn't start. Ford dealer said anti-theft system had to be reprogrammed at cost of $250 plus tow to dealer. I never armed the system and it should not have shut my truck down and prevented me from driving it. I don't have $250 and then I found out the repair is only $100 at most. But this according to my dealer happens to any Ford anytime the battery goes dead and is replaced, anti-theft system is making people pay $250 to Ford to reprogram what should not have to be reprogrammed. Please help me. Thank you. Cassandra watson-kevianne.