DELL India - Your company is denying to service my damaged laptop which is under warranty?

dell laptop purchased on 25/6/2011, from suntek, no.7, K.A.J. plaza, shop no. A2, narasingapuram street, mount rd. CHENNAI,
srvice tag no- 5ZGCVP1, EXP service code- 13027702645,

since purchase i have faced a lot of problems related with the hardware of this laptop, i had purchased this laptop keeping in mind that i may get instant service without wasting enough time and money but the results are not satisfactory, there was a problem with speaker, which i reported to ur mail id and i even got reply that i would be contacted soon (case#20110831133227275, case id 5310412), but instead i had to wait for a long time and finally go to my retailer who took one month to deliver it back. the problem i recently faced was that one of the hinge of the laptop became loose, with the bitter experience that i had in the past with the way u handled my complain, i felt it was better to visit the retailer, the retailer directed me to VENKTRON digital systems, VGP victory house, annai salai, chennai 600002, which looks after the after sales services of dell computers. At VENKRON i was told that the mounting at the base was broken, and that base would get replaced in mumbai, i was told to come after a week, after two weeks i received the laptop but the base was not replaced instead the hinge and base plastic was unskillfully molded and returned, the excuse that i got for it was that spare was not available. i was shocked to hear such a reply form a company which assures best customer support. when u sell a product with such a bad quality hardware, and dont have enough spare to replace in case of defect u should be liable to either replace the product or repay full refund.