Fedex — AWB#[protected]_ Pending with Bangalore custom

My package had already picked up from Hong Kong 3rd October 2020 and the initial delivery date for Chennai was 6th October 2020. On 6th October 2020, the delivery date rescheduled to 8th October.
In these period of time my package travelled HONG KONG-JAPAN-CHINA-NEW DELHI-DUBAI-BANGALORE. At current there is no scheduled delivery date.

On 9th October 2020 got an email indicating that the customs need additional documents for valuation of product. Provided the documents promptly after consulting with Fedex customer care.
Since then there is no status update from Fedex. Rather its just mentioned "Shipment Exception -beyond our control".

The package is in International Priority. If the document is required can be shout by the custom department on the very same day, then how come its taking indefinite time to review and clear that product?
Fedex is totally worthless, they say they are following up. What kind of following up is this if nothing is happening? What kind of service is this?

Customer care support is not attending my calls now.
Lost money, time and now waiting with indefinite patience for this.
Any help would be really appreciated.