Hewlett Packard Asia Pacific Pvt Ltd. — Hp7voice tab

Dear sir,
I have purchased hp 7voice tab serial number cnu50291vw from your dealer m / s unicorn, 256, bapuji nagar, bhubaneswar - 09 on 05 / 06 / 2015.
On 13 / 07 / 2015, it stopped working as no charging is happening.
I have contacted hp service centre in bhubaneswar, ensure support services (India)ltd, they kept for almost 12days and on 25 / 07 / 2015 they have replaced it with another set.
Again on 26 / 08 / 2015 the same problem arised, tis time they kept for almost 10days and on 9th sep they repaired and given to me.
Again, on 29th sep it is not working with the same issue of not getting started despite of charging for morethan 2hrs.
It seems tht the model itself is having a software problem which the hp people are not accepting it.
I request you to kindly return my money or exchange with a better model.