Try leaving the 'recirculate' button off, even when parked, so that fresh air comes in. This might be able to reduce the smell. We had that amoy pawis/amoy medyas smell before, and getting fresh air helped reduce/remove it.
such an awful problem to have, a mouth ulcer causing car. plus they want to bill you P7500 for a car that's only 3 months old and w/ a warranty to boot. something is definitely wrong w/ your car's a/c system (somewhere somehow there's stagnant water in there) and your casa, sir. hopefully, bro mazdamazda's preferred casa may find the remedy to your misery.