Jaquar — Shower type tap in the kitchen

I purchased this tap before two years. there is a water leakage problem from the day one, but i thought it as from sink. 2 months back my plumber identified that the leakage is from the hose of the tap, fitted.
because of this leakage the food stuff which i stored in the racks was useless... and i had a loss of around 3000 Rs., because I purchased a costlier tap from Jaquar.
i infromed this to the service center and iam waiting for past 1 month to get the problem solved...
and the service center are not responding now..
what should i do?