Unfortunately if you've owned a computer for a few months, and a company replaces or fixes a component they've fulfilled their duty. I do understand how frustrating that can be having an expensive computer bricked.
It's one thing for sure, if they attempted to fix it, and returned it in sub-par or a non working condition for sure. I think part of buying an expensive machine, is you expect absolutely 0 issues to arise. When it comes to computers, that's not always a realistic expectation unfortunately.
As nice as Apple's machines are, they are not made with the same expectations as a car in terms of reliability. A car can kill others if something major breaks or happens; but even still, unless you drive off the lot and a major issue happens within 30 days, they won't replace it unless you've purchased a luxury level automobile and the repair is just "completely uncalled for" on that level of vehicle, that soon.
Apple has been getting a bit sloppy with updates and hardware can not be "all its cracked up to be". Unfortunately, the computer business again, isn't up to the quality standards of a high-end luxury vehicle. The real issue is, how crap all other PC's are, and Apple does know to an extent "they make the best". I've personally experienced the attitude you deal with sometimes. Sometimes Apple's been great, no questions asked ... more recently it's "take it or leave it".
I'd just use the computer and enjoy it personally; but file a complaint about your experience at least. Just my 2 cents, as someone who's had a family member recently go through a bit of a runaround with their Apple iMac ... in the end, it was fixed and he was happy to just have it back and working and continued on with his life.