Gionee Communication Equipment — gionee p 7 /battery damaged

I purchase gionee p7 (Imei-[protected], battery-s/n-b[protected]b001gi), rs-9850/-, from pinaki communication (57, manujendra dutta rd, kol-28) on date 07.02.17. Within 6 month i observe defusing the charge very soon. When i realise the fact already passed 6 month, battery formed both side like "pellow". Though it was just covered the warranty period but it was damaged within 6 month. It was unexpected from this brand. Then i send the mobile set to authorised service centre at "icare" add-11/1/a, kali charan ghosh road, near sinthi more, kolkata-50, west bengal. It's ridiculous, painful and indescribable that one month passed still i get not return back my hand set. Day by day they are missing the delivery date. Service centre says battery is not available in market. Company should realise the fact what a hell due to deficient of my mobile set?? Did i commit sin to purchase this?? If the crisis of battery or any unavailability of accessories of this mobile is a great difficulties in your business policy, then it should be alerted to customer previously, so, the buyer may gets the opportunity to choose his own brand. I will be grateful if my problem resolved very soon. Manasi roy, 98, sukanta pally, p. O.-rabindranagar, kol-65.