Range Rover Evoque Immobilized Following Software Upgrade

[shivvy]

I left my car into the garage because I was receiving incorrect Theft Alert notifications.
They didn't know what was causing it and did a software update. But unfortunately that caused the car to become totally immobilized. I was told that they would need to put in a new telematics control unit to fix it.
I wasn't happy because before I left it in the car was running perfectly well, then while it was in their care it became immobilized necessitating me having to pay for a very expensive part to be able to even drive it away from them.
When I said that I wasn't happy they said that it happens on rare occasions so I thought I had been unfortunate - until he then said that it happens in approx 1 in every 10 cases - which I wouldn't consider rare at all! If that is the case should they not have notified me about the fairly high risk of complete immobilization? If I was leaving my dog into the vet for a scan and they said that there was a 1 in 10 chance of its leg falling off as a result, I would want to know about those risks so that I could weigh up my options!
I think I could have lived with receiving the odd mistaken anti-theft text rather than being without my car for 3 days and having to foot a very substantial bill just to be able to drive it home again.
Does anyone have experience of this kind of issue? Do the garages actions seem reasonable? Is this a common issue with Evoques? I there anything I should do to challenge them?
Thanks.

[shivvy]

UPDATE! I picked the car up this afternoon after agreeing a 40% discount. Happy enough with that. Thanks for all your help guys.

[Ellipsis]

Great news! Well done, shivvy ...

[satprof]

Very pleased to hear the news, although I think they've guessed that you wouldn't accept anything less. Distributors used to get about 40% off parts back in the day & I don't suppose that's changed much. Mind you, you never mentioned anything about a courtesy car - I hope that they had the good grace to offer one. Another thing you didn't mention was whether you had to sign some kind of 'work order' initially. I don't know the details of the Ts & Cs used in JLR distributors, but these often try legally to let the garage off any hook. In the UK, 'unreasonable' contract clauses can be challenged, but it all makes it difficult for the man in the street.

One thing for other people who might run into similar issues: Courts & mediators are much impressed by written evidence & hate 'I said - they said' as there's usually no proof either way. Had this not been satisfactorily resolved, my advice would always be to get as much as possible in writing asap. This does not have to be from the garage (or other supplier), although you should keep anything you have from them. You should write what I know as a 'Note for the Record'. This is a simple letter to the supplier, sent by Recorded Delivery. This is written as a letter, simply stating the facts in chronological order, but including what you were told verbally. Unless they dispute your account, it changes mere verbal statements into written evidence.