As for missing credits, Adgate customer service is terrible and all they do is keep delaying your requests.
I was supposed to receive the credits for Draftking but they just keep making excuses every day to delay my offer. I even personally contacted Draftking to ask for proof for my completion of offer. I sent the proof to Adgate but they just simply told me to wait 30 more days.
On the other hand, Superrewards customer service is great. They respond usually within one day and they will award you manually if you send adequate proof. Their offer provide less credits comparing to others but I have the highest success rate there.
And also be prepared to lose 1k-1.5k credit because of inadequacy of proof or poor customer service.