Audio [Q] 3rd earphone's left speaker went out-of-order

Salam/Hello,
I have been having a problem either with my phone or the earphones I have been using, finally yesterday i got sured that theres some problem related to my phone when my 3rd handsfree/earphone/headphone's left sided speaker stoped working...
actually i bought a in-earphones day before yesterday and the same night i used them for calling for more than 2 hours, then next morning i woke up and again put then in my ears played songs through SOUNDCLOUD and listen to 3 or 4 songs whille i was in way to office and till then my earphones were perfectly working, and one more thing i played songs on built-in player of the phone besides SOUND CLOUD...
than at the time of my off from my office i did the same put them in and then played song and guess what!! yes my left speaker of my earphone was gone dumb