Customs clearance for non resident

I have had a parcel from family in HKG sent to Spain and it is being held in customs clearance.  The Correos Aduanas service says one needs to be a resident and registered with Tax Services in Spain in order to do this!  No customs agency want to take it on as the worth of the parcel is 10€.  Any ideas to be able to pay what they want and get hold of the parcel?  Many thanks!