[Resolved]  Fedex — Package not cleared from customs and fedex customer support not responding

I sent a package from San Diego, USA to Goa, India on September 20, 2021. The package reached Delhi customs on September 23, 2021 and has been in customs clearance since then.
First, when I gave the items' invoice while shipping the package, the agent in Fedex office refused to attach them saying its not needed. I even mailed the invoice at [protected]@fedex.com. I have tried calling Fedex customer support several times but every time I get a response saying someone will call me back within 24 hours with the status of my request in high priority, but I have never received any callback from Fedex. Every time I have to call and they give me the same answer.
Nobody from Fedex India or Fedex US is supporting me in getting my package cleared from customs despite several calls and requests from my end. KIndly help me resolve this and clear my package from customs.