If the earphones are under local warranty we provide a replacement as per the manufacturers terms and conditions(no physical damage etc). If the earphones are out of warranty we try and help the customer in fixing it .
Having said that, not all earphones can be fixed. If the issue exists only with the 3.5mm connector end , it can be removed and a new 3.5mm connector can be soldered to it . We have done the same for some of our old customers but currently we can't offer the same services since we do not have our technical person available for the soldering job.
We do have silver metal 3.5mm connectors which we can offer to those who wish to try and fix their earphones/ headphones. Any local electronics /TV / mobile repair shop should be able to solder the new connector in 5-10 minutes.