Paytm — grievance against paytm

I have done an online transaction on paytm to buy school books from a stationary store Sureka Book house on 2nd April but book store was not in capacity to deliver within the day so I have to cancell the transaction and bought books from there only but off-line. Since then I am asking for refund from both ends but not yet I have been given solution.Both the parties (Sureka store, and Paytm) are putting blame on each other and I am in mid feeling helpless. My all efforts of calling to paytm helpline number is going in vain .Please help me in this regard as such behaviour from such a reputable company is unacceptable.
My complain id with paytm is[protected]
Regards,
Onkar Agarwal