Thanks for reply.
i haven't rooted the phone or installed any app.
till yesterday night it was working perfectly and on today morning i found it rebooting again & again after Alcatel logo.
i have tried to hard reset it but button codes to hard reset are also not working.
If u can please guide me any more option to hard reset or get this issue resolved i would be very thankful, as i live in very remote location and service centers are about 160 KM from my residence.
Thanks & regards