Hello :) I have completed an offer from the AdGate offer wall but I didn't recieve my coins.
I have contacted their support and explained to them what happened.
After 3-4 days they replied to me that I should have recieved my GoCoins. I checked and unfortunately I haven't recived my GoCoins.I sent another EMail to them in which I said that I haven't recieved my coins. Today they sent me a message saying:

Hi
Please be advised to contact the website. Credit is already applied, unfortunately there is nothing further we can do.

Sincerely,
AdGate Customer Support.

Please help me.

The offer was:
Final Fantasy XV
+320 GoCoins
Android
Final Fantasy XV
Be the hero of your own Final Fantasy XV adventure in the brand new mobile strategy game Final Fantasy XV: A New Empire! Build your own kingdom, discover powerful magic, and dominate the realm alongside all of your friends!

Install and Reach Citadel level 10. Eligibility: Must be installing the app for the first time and have Android 6.0+. ***New Users Only*** Users must download and OPEN the app within 15 minutes of starting (clicking) the offer.

I did complete the offer. I have a screenshot proof.