To bring this to the attention of the admins you will need to submit a customer support ticket via the market site detailing the nature of your complaint regarding the vendor in question. You are unable to get assistance for issues of this nature via the forums I'm afraid, moderators do not have any admin privileges on the market site, you have to raise it there. If you need further assistance with regards to resolution matters please have a read of the SR wiki, there are links in the sticky thread at the top of this board to guide you.