Sony VAIO
Speaker is not working properly

Sir,

i have Sony vaio e-series model no.-vpceb16fg.

i am not satisfied from this laptop`s speaker . when i had purchased this laptop after one day my laptop`s speaker is giving problem to me and then i give this laptop to Sony service center and they repair this laptop but again and again so, kindly take n action regarding this problem, otherwise i have to take some action regarding to this problem.