Send your questionnaire to us in the envelope you've received with the invitation. If, by mistake, you did not receive an envelope you can send the questionnaire to the below address. No postage stamp is needed.
Effectory B.V.
Postbus 20620
1001 NP Amsterdam
Netherlands
Are you unable to find the answer to your question?
Our friendly helpdesk will answer all your questions as quickly as possible.
We are happy to help!
Complete the request form here:
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(Only English or Dutch)
Hours of operation:
Monday - Friday 8:30 AM to 5.30 PM CET
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