Our iOS app does support some collaboration options. For example, you can create and reassign tasks to your collaborators and you can view and edit joint tasks.
Our app description says this:
Existing Toodledo.com Pro subscribers who use subtasks and collaboration on our website will also have access to subtasks and some collaboration options in the app. Some functionality on Toodledo.com is not yet supported in the app.
We believe that this is an accurate statement. We are not trying to dupe people. We do plan to bring the other collaboration options to the iOS app in future updates (viewing workspaces, creating new joint tasks).
If you would like a refund, I would be happy to provide one.