Lenovo — Faulty tab and no repair for 14 days

This is regarding my Lenovo yoga tab 2.0 I bought it online from flipkart. Within days the tab started malfunctioning. It goes off just like that and then refuse to restart. For several hours the tab do not recharge. I requested flipkart for a replacement. They replaced the tab with a new one which was as bad as the old one. This tab starting malfunctioning exactly the same way. Lenovo Yoga Tab 2.0 serial# HA059EAU I called the customer care and they asked me to give it for repair at their JanakPuri authorised service center called Sysnet Global Tech Pvt Ltd. This was just the beginning of a nightmare. I gave my tab for repair on 6th April 2015. Its more than 14 days and not even once the service center guys called me and gave me a status report. When I called them I was told that they have asked for a new mother board but they haven't received it from the warehouse. They have no idea when will they get it. They asked me to get in touch with customer care again. I called a couple of times to customer care and all they have to say about it is that they have no idea when will they get the part. I called the Sysnet Global Tech executive again and he said I should take my Tab back in its current faulty state. The executive name is Mr. Nadeem Khan and his employee id is[protected] Its more than 2 weeks and I have no idea when will I get my tab back. I am loosing out on my work because of this and also my data plan has also gone waste for 2 weeks. I want Lenovo to take an immediate action. I want Lenovo to take this substandard product back and refund my money. More so I would like them to compensate me for the harassment I had to face.