Buzzing Earphones?

Ok, I know we've all had a discussion about the bundled earphones being rubbish and so forth, but I was content with them, not least because of the really useful mic/button built in, that was invaluable to me.

So anyway, now, just month after purchase, my earphones are buzzing, specifically the right one, its worse on louder volumes but there's a definate buzzing sound during certain songs. Doesn't happen with another pair of headphones.

So crap earphones? Broken earphones? Any fixes? Do I buy another pair and hope for the best, or are there any alternatives out there?

Ideally i'd love a pair that had the mic/button to control music and answer calls etc.

Any suggestions?