The dealer should not have disabled the theft system. If car was stolen due to a disabled theft system, the dealer would be responsible. I doubt insurance would pay if the security system was intentionally disabled.
Take it back to dealer and have them repair it.
There is a procedure for reseting the system:
Turn key on
security light flashing
try to start and let go leave key on
security light flasher for about 10 min
when it stops
turn key off and start car
key needed to be reprogrammed
happy driving after that
in some rare cases you may have to do that 3 times total of 30 min.
However if an aftermarket remote start, then that could also be the problem.
Monday, August 24th, 2020 AT 11:18 AM