I've just tried the Live Chat on their support site.

Quote
Monica : Welcome to MycroBurst.com-Support. How can I help you today?
ScriptKeeper: Can you please close my account or remove my e-mail address from your mailing list - mark@******.com
Monica : What do you mean do you want to cancel an order?
ScriptKeeper: No. I registered with your site to enter a logo design competition. It was a one-off thing for UBB. I am now getting e-mails inviting me to design logos for other people and I can't unsubscribe anywhere on your site.
Monica : Sorry designers do not have live chat support you should email support@mycroburst.com with your request.
ScriptKeeper: I have - twice. They just keep closing my ticket and ignoring me.
Monica : What I can do forward them this chat conversation with your message. Do you want me to do that?
ScriptKeeper: Yes, if you think it will help. See Ticket ID 7276.
Monica : Done.
No convinced but we'll see what happens.