Mate as bad as it sounds - these things just happen sometimes.
The best thing you can do is keep on their back and make it clear in writing that you expect some form of compensation for your troubles.
That is ontop of them providing you another service vehicle / demo car (whatever) to use for all days that the car is experiencing this issue.
If they dont come to the party at that level, get a solicitor involved or local ombudsmen etc.
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