Fedex — International shipment delayed from four months, no customer service response

Address:

2nd Floor, West Wing, No. 15, 1st Main Road, 6th Cross, Gandhinagar, Bangalore, Karnataka, India - 560009

My shipment from the USA arrived in Delhi on January 12th, 2022. According to the tracking, it was under clearance delay from January 13th, and since then, there has been no update on the shipment nor any response from the customer service team. I have written several emails, but no reply nor any solution has been provided. The shipment only contains one mobile phone, which isn't even prohibited.