Lenovo — pathetic service for my tablet

Address:

Gautam Buddh Nagar, Uttar Pradesh

I got a lenovo tab inin june2013, but there is a problem in my tab since feb2014, initially when iI visited a service centre here I was told that they need to format it for which I need to pay rs1250, inspite of being in the warranty period. I lodged an online complaint on lenovo support wherein I was given a service call num [protected] n I was told that my problem wud b fixed free of cost.since then I hv been running to this service centre n everytime I visit I hv been updated with a new problem, first they said it needs formatting, the problem remains, then they said the mother board needs to b changed, the problem still persist, then they said ur tab is not switchingon, then they said there is a virus, my tab isn't working properly since then and now a new problem, it gets sswitched off itself every now n then and the volume is very very very low inspite of keeping it on maximum, ...what do I do?pls pls pls help