We have a quite simple quality policy: we do not expect you to pay for poor quality or duplicate leads.
We have in place technical measures to prevent multiple clicks and try and restrict as much as possible duplicate leads, but we have to balance any automated measures we might put in place against the usability of the site, and the desire by some users to compare costs for different survey types.
Consequently we recognise that some duplicate referrals will be generated. We do not expect you to pay for duplicates, so please simply forward the referral email to firstname.lastname@example.org - simply mark it "duplicate" (we don't need to know anything more than that) and we will credit it to your account.
Poor Quality Leads
For a lead to be valid it must have at least one valid method of contacting the user, either a valid email address or phone number. If none of the contact details are correct, or you feel it to be of inadequate quality for any other reason, simply forward the referral email to email@example.com marked with the reasons why: e.g. "no contact details" and we will credit it to your account.