OUT SPEAKER NOT WORKING

I got this mobile one and a half years back only, suddenly i faced a problem that i couldn't hear the ring tone while iam receiving the call and not able to hear the songs, only the videos are visible without sound but when i connect the handsfree i can hear the music...I have given my mobile to Sony Ericsson Dealer, even they ere not able to help us, they said that the sound track inside the mobile is damaged and no one was able to repair the mobile, currently we are using the mobile without the ringtones, now the mobile is used only through vibration alerts. Please help me in solving this problem