Customer service is open daily from 07:00 to 19:00 London time.
Please, before contacting customer service, read «FAQ» section.
Perhaps answer to your question already exists.
General issues: firstname.lastname@example.org
Financial issues: email@example.com
Security service: firstname.lastname@example.org
Also, you can contact support via online chat, which is located on right side of bottom of site, by clicking on its icon.