Flipkart — Still no refund issued for cancelled product even after 1 month

I have been a flipkart customer since last 10 years and this the first time flipkart is acting like this. I ordered a router from flipkart and I had cancelled it later, even then the delivery guy came which i refused. Still I did not get my money back. In app it is showing cancelled, I reached out to them on app, twitter still no help. Customer support is saying this is due to technical issues and it has been escalated and twitter support is saying to connect with flipkart customer support. Already been a month since still nothing happened, stuck in same stage.

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What should a a customer do?