India Post — not received article

Address: 350055

This is to inform that my article, which contained dates and few plates was booked on 29th september, 2017 and paid 3400 rs. From madina, saudi arabia to be received at gpo, ahmedabad, gujarat. Article number was ek[protected]sa. It has already been 15 days and have not yet received it department of post nor any call from their side for the delay. Now when i check the status it shows it has been sent back to madina on 30th but the reason for sending it back is not known. Kind do the needful.