Issue with Expert Hire

Hi, I recently hired one of your experts to complete a project. After I paid her, she stopped working on it and has not answered any of my e-mails since. I would like to contact someone about this issue as I am very disappointed. I wasn’t able to find any information about who to contact, so was hoping you could provide me with the phone number or email of a manager who can help me resolve this dispute. Thank you.

Ian