State Bank Of India [SBI] — Refund completed from flipkart end but not received by SBI

Address:

Arya Kumar Rd, Bangali Akhara, Rajendra Nagar, Patna, Bihar 800016

I ordered Apple iPhone 12 from Flipkart on the 3rd of October. But due to some reason I had to cancel it. I cancelled it on the same day i.e. 3rd October. After that, I was told that I'll get my money by the 8th, and yet still I did not get my money back. I contacted Flipkart customer support they told me that refund has been completed from our end and they provided me with ARN number to check with SBI. But the SBI customer support doesn't even know what ARN number is. Even after going to the home branch, they are saying ask Flipkart to refund the money.

Please help me out. My 1 month salary worth of money Rs 46549 is stuck and no one knows where.