India Post — abstraction of contents by india post

Address:

Jorhat, Assam, 785705

I had ordered few musical instruments from thomannmusic based in germany. But the package delivered was in a very bad condition and the items have been replaced with a fitness mat and two foldable chairs of indian make. And the invoice was missing too. Tracking no:cc[protected]de.
I am really disappointed and angry with india post for such a bad conduct. Please help. As i had to save money for a while to make this purchase and now i am disheartened. And i still had to pay custom duty for those indian products.