Depends what you're monitoring, you may just have 'confirmation bias'.
As it is, you don't provide a way to report or flag the bad offers, and the official response (as you clearly state) is to take it up with them.
So you won't have reports on the matter, and you won't have many offer issues as all the people who had issues, like me, will stop using their offers.
So you're left with few reports and infrequent issues. But the problems are still there.
99% of the people who are using the offers are satisfied. Sure. Because all the people who were not, are not using them anymore.