parcel2go issue - Return to consignor has been requested

i sent an item back to amazon.de for a refund via parcel 2go
but it has been redelivered back to my address

parcel2go have no idea why this is happened.

"Return to consignor has been requested" this is the message i get on the website

it had all the correct forms attached on box etc for international delivery - that were provided by parcel2go

i dont understand, but i am a loss of the cost of postage now