Sony India — speaker problem,worst service

Address:

Mohali, Punjab

i have speakers problems in my laptop, many time i had visited there but they just adjust the settings & return it back to me after saying that they just changed the speaker but they didn't . last time i visited again & shouted on them then they really changed the speakers after keeping my laptop for 15 days but the sound quality of this new speakers is worst than the previous one also the volume increase/decrease function is not working . now i don't know what to do .