This message is displayed when a member has made new requests over the maximum allowed.

Here are the steps you need to take to in order to re-activate your account.
 
Step 1: Check your account usage stats in the member STW Dashboard to see if your account is currently in over the limit status.  If it is not skip step 2.

Step 2: Upgrade your total monthly requests limit. (This step will immediately re-instate your account)

https://support.shrinktheweb.com/Knowledgebase/Article/View/47/0/how-do-i-upgrade-my-account

Step 3: Modify your code or request methods to stop making requests after you have reached your monthly quota limit. Do so by following our best practices described in the STW Testing Guide

https://shrinktheweb.com/uploads/STW_Testing_Guide.pdf

Step 4: Contact us letting us know you have completed step 3 and allow up to 72 hours for the ban to be lifted.