To contact MM Wall with any issues related to a specific offer, please head to the "In Progress" tab which you can find in the lower middle of the offerwall:

From there, select the offer that you are currently having issues with and click the support button at the top right of the offerwall:

From there, answer the next questions so MM Wall can assist you accordingly.

For any general inquiries, you can contact them via their email: mmwall@tv-two.com