Paytm — Cashback return

Address: Gautam Buddh Nagar, Uttar Pradesh, 201301

Website: paytm.com

I purchased a phone a was successful delivered to on 27 april 2016. And applied a code get12. The code was successful applied. Till date i was unable to receive my cashback. I mailed them twice from complain link but no reply received. They said "cashback will be added to your paytm wallet after return period of item is over"
When will it be over? I want it ASAP.