Sorry to hear about your trouble and I can't offer any advice about repair or replacement, but I'd say that it's the dealer/mechanics fault and I'd be expecting them to sort it out. Something should have told the mechanic/expert who you paid good money to effect a repair on your vehicle, that something was amiss when he had to extend the breaker bar. Any dope would know that something would break, it's only alloy for goodness sake! Looks like he just used brute force to extract the pin rather than heat it up to soften the Loctite on the thread. Hope you get sorted!
What could possibly go wrong?