Domino's Pizza — refund not received since 20 days!!

Address:

560087

Hi,
I have placed an order at domino's india online and paid via paytm on september 25th and until then everything was fine but after a few minutes the store people called me up to tell me that few of my ordered items aren't available and asked if they can provide me with another item in exchange. I have denied their offer and asked them to cancel the order. They said they cancelled it. But it's been nearly 15-20 days and i haven't received any cancellation message which they insisted would come neither received any refund even after number of calls and messages all they have to say is the money will be refunded back within 2 days, 2 days which never came!!
This is becoming a real stress to take asking and getting behind them to refund my money.
I need this to be resolved asap so i can do work in peace!

- bhargav bommali