Paytm Mall — bajaj geyser

I booked Bajaj Geyser( order id- [protected]) on 9/10/18. The item was not dispatched till 11/10/18, I cancelled it due to dispatch delay. The cancellation was initiated by company which appeared in mobile app. On 13/10/18 I received delivery message. I was at home and no delivery took place. Since then, I am trying to contact, but lines are busy and no other way of communication is provided by company. I am still waiting for my refund.