PTC Wall is one of our most popular offer walls and is used by thousands of users each day. Please keep in mind PTC Wall only credits accounts after you earn at least 20 coins. A very small % of users have problems getting credit from certain types of offers, usually ads that you have to watch to earn to credit. This effects about 1% of our users.
Unfortunately there is absolutely nothing we can do about it. We have no control over PTC Wall and when they notify us to give credit. We have contacted them numerous times regarding the issue but have not came to a resolution.
If you are not getting credit for specific actions/offers on PTC Wall, please do not open a ticket with us and just stop doing those types offers. We are not able to help you.