Bigbasket.com — Order showing as delivered but not received

The delivery partner called me and asked me to cancel the order as his bike was not working. The same thing happened 2 days back and I did cancel the order that time but today I didn't want to cancel it. I tried reaching customer care but the chat support executives said they have arranged a callback but no call came from their side. Now the order is showing as delivered but i haven't received anything of it.