Saturn 2003 L200 Security Problem and Battery continuously dying (battery is brand new)

Hello, i am having issues with my 2002 l200
saturn. About 5 months ago the car wouldn't start
in a parking lot and luckily we were next to an oil
changing location so one of the guys came over
and tried helping us out. He said it had to do with
the security features and needed to be reset.  He
tried many different things and waited 10 minutes
and would try something new. It didn't work so
we had it towed to a mechanic.  After 3 days in
the shop the mechanic could find nothing wrong
with the car and said it was starting fine. About 2
months later the car wouldn't start again so my
husband thought it was the battery so he jumped
it and we then bought a new battery. The next
day i went to start the car and it wouldn't do a
thing.  It is completely dead and wont start. I
called the closest GM dealer which is 45 minutes
away and they said they would take a look at it.
We dont have the money to pay the towing fee
and then the possibility the dealership might say
they cant fix it, then we'd have to get it towed
back home again. Does anyone know anything
about this problem? Making a $380 car payment
every month for a car we can't even drive is not
the best feeling. Any help would be GREATLY
appreciated.  THANKS!