Blue Dart Express — Discrepancy in charges

Address:

534003

Sir, i sent a parcel of medicines with no. [protected] to germany on 23 march 2016. As medicines are not allowed to be sent to germany the parcel retuned and i received it on 11 april. The no. On return is [protected].
I paid rs. 9500 for the parcel of 3.9 kg while sending it and rs 4500 on return.
I would like clarification on why i was charged an extra rs5000. It should be the same to and fro or a little extra for packing. The packing box was provided by me.
Kindly clarify.