I am afraid to say this is not an Intel® Official page. As you can see the email domain for their support contact is firstname.lastname@example.org which is not related to Intel®.
This seems to be a scam but as mentioned before, this is not Intel®.
I too have issue with this site, failing to pay out due to T&C's not advertised on taking out the promotion.
Are you sure they are not Intel? - They sure are trying their best to look like it (what with the colour scheme and details on this page)
If they are not I would get your Lawyers onto them ASAP as they are beginning to give you a bad rep.
Terms and Conditions
Intel Corp. (UK) Ltd. (“Intel”) Cashback Promotion (the “Promotion”) Terms and Conditions: