Response from Trent Williams of ClassMarker
Sorry to hear of your experience here. Our global users find ClassMarker easy to use, and very flexible due to the large range of features and flexibility we offer.
Did you try reaching out to our 7 day support team, which you can do here:
Regarding our free usage, yes we do offer free services to our Teachers and Not-for-profit organizations to help these customers out who have limited or no budget. We don't however advertise unlimited usage, I'm not sure where you may have seen that. Just to let you know, you can review all our plans and pricing details listed on our Pricing pages here:
Again feel free to reach out to our customer support team anytme, we are here to help 7 days a week.