I would venture to say that if I called Cingular back, they would think I was crazy and they would let me keep the credit anyway. Of course I'm not gonna try it because $250 is a lot of money and it's a Ta'os Akum so it's Muttar to keep.You can make a much bigger Kiddush Hashem by walking back into Home Depot and telling the cashier that she gave you 6 cents too much for the change.
depends on your name.
Why by walking into home depot to return 6 cents you make a bigger Kidush Hashem than by informing cingular that they gave you $250 they don't owe you?
Again depends on the rep.
You must be under the impression that many of these reps even know what a frum yid is?I assure you that many have never seen one in their lives and still believe that Jews have horns.