Delhivery — Pickup for refund

I have to return the product. I tried to call delhivery pickup agent but the phone number they provide never connect to them. And when I check the status of return of my product it is showing . I cancelled the return. But I never did so. Kindly help me in this regard.
I also mailed on customer support services of delhivery but there is no response from their side too.
I raised a ticket also.
But I did not get any revert from them.
Kindly help me in this regard.