Tyres worn very quickly

Are you sure it wasn't balancing ?

Are they worn right across the tread or just along one side ?

Lots of reasons for that to happen other than alignment. Could be suspension issues like worn bushings or even just tyre pressures.

There's a full description of what causes inner tyre wear here:

If you don't trust the dealer, maybe take it to an independent mechanic or tyre outlet for checking.

Sometimes it's just convenient. Car in for a service, dealer phones you to say your tyres are very near the minimum and do you want to replace them? Quotes a price and for the sake of convenience and maybe it's only costing €20 more than the tyre place so you say go ahead.

Whats the make and model of the Tyre.

Did you get a printout of the tracking results?

Just a few points on the idea of taking a small claims case:

1. No proof tracking was or was not done, nor paid for by OP
2. No way for the OP to prove they didn't drive like a loon for 9 weeks
3. Anything that happens after the car leaves is outside of the control of the garage (pothole, kerb etc)

The tracking on the car is out and has caused excessive tyre wear. Knowing the size and brand won't add anything to this discussion.

The OP needs to get back to the garage and see what they can do to resolve the problem. As already pointed out, if there is no tracking listed on a receipt, it will be very hard to prove as the evidence is not there. If the garage admit to doing the tracking but not documenting it, then ask them to supply a new set of tyres and fix the tacking.

Is that relevant? No tyre brand or size should wear that quickly

Tyres normally lasting 12 months is a big of a red flag to me?

4,000km in 9 weeks, works out to be 23,000km in 12 months, which is pretty low milage for even front tyres on a Front Wheel Drive car I would have said.

€80 per tyre, fitted, at a dealer, implies that they probably aren't greet tyres which were fitted to be honest.

@beggars_bush What is the car, how old is it, and what is the tyre size?

seems definite the tracking was done, what you need to find out is if it was done properly - the tracking report would have helped you determine that (see link below)

It's possible the mechanic set up the tracking system for the wrong car model so the while it might drive fine, the tyres will get eaten. I've had it happen to me once but spotted the mistake straight away as I always ask for a copy of the tracking report. Most places won't automatically give it to you unless you ask and unless it's printed out immediately, the information is lost

https://www.mevotech.com/article/how-to-read-and-understand-a-wheel-alignment-report/

You can. But to be specifically bad on the inside is something else entirely.

I'm not sure how it's possible for the inner part of the tyre to have a compound different from the centre and outside. Just doesn't make sense. Open to correction on this obviously as I don't generally research tyre construction methods.