DHL Express India — Where is my package & what documentation is needed - [protected]

My package was sent to sweden and returned to India in a week. But The return package came to India on the 15th jan and I still dont have the package with me nor the reason to what documentation is required on a return package? Is there is a follow up mechanism or will keep the package for years together with no followup? The DHL tracking page does not say wat documents are needed and the Info.[protected]@dhl.com and Maa.[protected]@dhl.com has no idea about the procedures to respond to emails. Not sure what is wrong with INDIA DHL. SWEDISH DHL was quick to respond to emails and calls. I AM HIGHLY FRUSTURATED-

I am not sure how a package was sent in the first place not knowing the destination country guidelines and it is truly a bad experience and water of money.

Official email address for contact:

[protected]@gmail.com
sai.[protected]@gmail.com.

[protected]