How many miles you have on your engine? On my eclipse, at 60k miles, the tensioner pulley and some other parts must be replaced mandatorily just due to natural wear. You may have something similar that you are unaware of. Consult your owner's manual or roll into a mazda dealer and ask for the XX,000 mile service checklist.
Your mechanic may not be wrong that the belt is perfectly fine, but I agree that you should get a new mechanic if he's not taking the time to find out exactly what's wrong. I have to raise my eyebrow on his decision to change out the alternator... sounds like he's milkin you.
A perfectly installed belt will not squeek. It should not need dressing or anything to dampen squeeking. If the belt is fine, something else along it's rotation is making the squeeking. Can't really say for sure what it is, but regardless, opt to change to a new belt when it's identified and fixed. You don't know what the current belt has been through, if it's been stretched, beat up, etc.
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