But it is necessary to contact the provider of the offer, if said offer has caused an issue.

As I explained - These offers aren't provided by our system. That's why each provider has an Offer Wall from which players can chose the offers and a lot of times get redirected further away from the Offer Wall and the Top 11 app.

This is the procedure. We can in no way verify if an offer has been completed successfully, thus the player has to write to the offer provider's support so the completion of the offer is checked and approved. Which often requires a few screenshots due to the nature of many offers being you register for the advertised service and other such.