Most of the time, these casas just subcon the job to third party shops. So since toyota fan ka, hanap ka ng subcons ng Toyota (if you wanna save money).

Since ginawa at chineck na yan ng casa, shouldn't they guarantee that it works properly? Di man lang ba nila tinest if it gets to the set temp?

Dun ba sa Toyota mismo ginawa yung car mo? Did u see them do it? Kind of surprising for a 3yo car to get a busted AC. Tama ang suggestion na replace your AC filter periodically. Parang AC sa bahay, you clean it thrice or 4x a year to keep its optimum performance. If you don't, not only will you not get the temp you want, you'll pay higher bills too.