If you drove it there and there were no lights, no problems and now you can only just limp home.... it should be their problem.
If you'd done it yourself it would be yours.
The bill should only be for the work you asked to be done - no more. If inexperience or lack of knowledge was the cause its their problem, again its their issue.
By accepting a job, verbally or in writing anyone makes a contract to their ability to deliver the required outcome.
I hope it all works out for the best and sympathise with the patrol option