DHL Express India — Delay in clearing sample packet

My AWB no [protected] was shipped from Ohio USA on 14th sept 21 it landed here at Mumbai on 17th sept 21. From there onwards the packet smaller than a shoebox containing sample pieces is awaiting customs inspection. This is almost 20 days it is lying there to get cleared. The customer service giving typical information that it will take time since backlog is to be cleared. Further I get email from clearance assistant that the shipment is still under inspection with a foot note of warehousing charges would have to be paid by me since the material is lying there for more than 48 hours. It seems this is an intentional delay to extract money from the receiver