Re: The Brera tractor . . .
First port of call is the hire company, you have a contract with them to drive a Brera, not a piece of small smelly jap-crap. Keep a diary of all the problems, the time/fuel you're spending buggering about going to/from the garage, the phonecalls, etc. Insist that they open a case number for you that you can reference every time you either phone them or email them a diary update and don't let them close it until you're 100% happy with the car.
If you don't start sowing the seeds of disgruntlement early then they won't do anything for you.