In future you should take screenshots of every step of the process to prove the offer has been completed. Then if you do not get paid you can contact them using the support button and add the screenshot files to your request.It is a hassle but I now get paid for every offer that doesn't give you credits. We shouldn't have to go through all that but seeing as at least half the offers do not pay out initially, I think it's worth the hassle. You will get the credits within three days.