Did it pull to the right with your old tires and wheels? If they were good you probably have a
tire problem. If you don't have directional tires switch them side to side. If the pull moves
you have a bad tire. Alignment will not help bad tires. If the tires are directional switch them
front to back to see if pull moves.
There is very little camber and caster adjustment on the Mazda 3. It's only enough for very
fine tuning, not enough to correct a wheel pull. Toe adjustment is done to correct for tire
wear and directional stability, it will not cure a wheel pull.
There are lots of junk wheels and tires out there. Maybe you need an alignment but don't
expect it to cure a tire pull.
Clifton