Zen Mobile — zen cinemax force

Sir,
Purchased zen cine max force from t. K. Traders 16, narsinapuram st chennai-
On 22.2/17 after a month it had soft wear issue it was ressolved @ ur service centre m/s. Siddhi communication after 3 months same problem started again it was resolved @ same service centre. Again same problem started last week i had taken it to the same service centre, he told that he will change the soft wear after changing it becam bad to worst
Now mobile is not opening it takes time, i have spent rs. 600 for 3 visits to your sevice centre
My request is to take back the mobile replace with updated version for which i am ready to pay the difference in amount, since its in warranty kindly do the needful
Regards
N. Tikku
Mob.[protected]
[protected]@gmail.com