i've actually done a number of offers that require CC numbers, just on Gaia and not here. i can type up a short list of suggestions & my general experience if you (or anyone else) decides to start a guide thread that lists good and bad offers?

it would be nice if subeta would make a list of 'bad' or 'generally untrustworthy' offers so that users know not to bother with them, but as far as not getting your credits goes that's entirely up to the offerwall support staff to assist you IMO.