As i mentioned in a subject that Tracking id RB596953733SG held by Mumbai Customs,
and current status is "Retention Reason : Retained by customs for unspecified reason"
May i know What is Exact meaning of this?   also why this status is update by Post?  
and what is the solution for this?  
Whom to contact for this issue?  
how much time it will take to reach my address? 

Parcel content is Small Projector Cost 34$.