Advice on attending a course

Hi,  

I recently had to attend a course via zoom. I was told to install the app. Which was Zoom basic. I was eventually locked out of the room due to only having audio and no video. Zoom basic says that I am only able to attend meetings which are 40 minutes long. 

Does anyone know whether I should have been advised to buy a  30 hour per meeting subscription on zoom? I.E Zoom Pro? Could that be why I was stopped from being present? I have lost a lot of money and am now expected to pay for the course again. 

It wasn't my internet connection and I bought a new laptop because it was an ongoing course.

Any help, suggestions or ideas would be greatly appreciated please. Thanks so much