Hi @A_fdm, returns can only be made via PostNL or a KPN store, not DHL. This is always free of charge. If you write the information below on the box and give it to them, you will be fine. 

KPN Antwoordnummer 10119
2400VB Alphen aan den Rijn

Hi @A_fdm 

As I told you earlier in this topic the correct address for returning KPN equipment is

KPN
Antwoordnummer 10119
2400VB Alphen aan den Rijn

The Netherlands / Die Niederlande

Make clear to the German postal service that this is an address in the Netherlands.

@A_fdm The address is invalid because the postcode is missing

@DaveA A international parcel shipment is not free of charge, it does not matter with DHL or POSTNL or whatever. You need to pay the cost for schipping from abroad to Netherlands

We did, you just can not see the whole address as they put a return sticker on top of it

@A_fdm You can try this adres

KPN Klantenservice

Postbus 235

2400 AE Alphen aan den Rijn