Technical support for domain names registered through www.c1-domains.com is provided by C1 Domains based in the USA.
To obtain support by email: Please visit www.c1-domains.com and click on the Support link you'll see in the main menu bar at the top of the page.
To obtain support by telephone: C1 Domains is based in the USA, in the state of Arizona. If you are based in the UK you can use a special "London" number to get in touch with them without paying for an International call. The number is 0203 027 4996.
Alterntatively you can dial C1 Domains directly on +1 480 624 2500. Please remember that this will be charged as an International call to the USA, though depending on your telephone service provider and calls package is may be less expensive than calling some numbers in the UK.