I once had an authorized Apple reseller and repair shop replace my earphones within the one year warranty. They where in good condition, physically, but one side did not reproduced any sound. Had to wait a week for the Apple-sent replacement.
I bought that iPhone directly from ATT store, and they denied an exchange, quoting that the headphones were not covered for the 1-year warranty. But the authorized shop insisted they were, and in fact, delivered on their promise.
Now, if yours are physically broken, I don't know if that would fall in the "abused" category, not a normal wear and tear...
Wish you the best...