Intex Mobile / Intex Technologies — intex power plus same fault again

Address:	Rajgarh, Madhya Pradesh, 465674
Website:	INTEX

I purchase a intex power plus mobile before 15 month, and after use of 3 month it's getting charging problem, after give to service center they repair my mobile in 15 days, and again after 6 month i got same problem, again service center took 15 days for repair and now when my warranty out again same problem i had...
Now they told me approx 800 rs. Charge for repair,
I think they every time repair my mobile not perfectly because i had same problem every time i think i already repair same problem more than 3 time in warranty but after every 3 month of repair it's back again..
Plz solve my problem and show your company as a respectable company...