Paytm Mall — return not received

Website:

www.paytm.com

Few days ago, I have ordered a Vivo v5s mobile and paid R.s 17089 through
SBI Debit Card.After 4 Days, i cancel the Order on 07/10/2017 through Paytm App. They said Ur return is processed and credited to your wallet, i have checked my wallet, there are no amount they refund. I have contacted through chatting, they said your refund amount already credited your wallet and you transfer it to your bank. I checked my account but not credited. Then i have tried to contacted, they said this issue is closed from our end . My total refund amount is R.s-14371. Please help me.