To contact Revlum regarding an issue with an Offer hosted on their Offerwall, go to the Freecash Earn page here, scroll down to “Offer Partners” and open up their Offerwall. You can also open their Offerwall by clicking here.
After opening the Revlum Offerwall, find the specific Offer offer you are having issues with, and click to open the Offer.
Beneath the QR Code you'll be able to click the "Report a Problem" button which will then allow you to contact Revlum's Support.