Usps — package arrived, at mumbai held in customs since 2 days but no update or contact from usps

Address:

Mumbai City, Maharashtra, 400050

I have fractured my leg and my doctor advised me to try to use the knee crutch, which is only available in the us, i ordered it online from amazon.com and got it shipped to my friends address in usa, after recieving the product he sent it to my india address by usps.
The parcel has reached mumbai and the tracking on usps website shows its held in customs since 2 days.
There is no contact from customs department or usps for producing any documents or pament of duty etc. Im clueless as to why no one has contacted me yet, which is usually the case with any other courier service provider.
Iv been calling the number for the customs office given on their website but there is no answer.
I need to have the crutch since its hampering my mobility.
I even contacted usps customer care and the reply was its a different country customs for which we have no control of so you will have to figure it out yourself.
Some one please guide me as to how i can get the parcel.