India Post — My letter with important documents is stuck in IGI TMO for the last 12 days.

Address:

Prakash peter, near christian boys hostel, heeradungri, Almora , 263601

Tracking number is EV[protected]IN/[protected]
Hi
I live in Edinburgh, Scotland. My parents live in Almora Uttrakhand. My father registered to me some very important documents from Almora on the 8th of March. Through the tracking number I see that the letter travelled smoothly till the 12th of March, when it reached Delhi. After the 12th of March the status says IGI TMO, send to receptacle abroad (Otb). And the letter has not moved from there since that day. Sir/Ma'am its been 12 days, my father being a retired person spent almost rs2000 to send me those documents through registry post as DHL or courier is very expensive.
Tracking number is EV[protected]IN/[protected]
I am not able to attach the copy of the receipt and all the screenshots I have taken of the tracking history. How can I do that t provide more information?