I bought a 2005 PT Cruiser

Now a friend of the original owner lost the key
that was the only one for the imbolizer. We
took the car to Harris Chrysler on Cook and
View in Victoria BC the shop diagnosed the
problem and told us the part and labour to get
the car to work would be $780.00 I paid them
and then they did the work. Now before the
car would start but then die right away as
soon as it turned over. Harris Chrysler said the
part they installed failed and they asked how
much do I want to spend and quoted me an
additional $1500.-$2000.00 I have the texts
that said they failed twice. Now the car does
not even try to start there is power and
everything but no effort from the engine. They
said that I’m out the money and tough luck.
What can I do I seen many ways to bypass it
on YouTube but I wanted to have it done
properly in case I wanted to resell it. I’m out
the cash and worker off than when I took it in
any ideas I am stressed and need my car for
work. Any ideas I would be eternally grateful