Frustrated with Zoom

I feel that the customer service is very bad. I received a special offer with a discount for two months for 500 attendees, and when I accepted it, they signed me up for a year subscription. In my experience, when I tried to cancel it, the app refused and got me a message saying it could not be canceled till the end of the year. I contacted customer service, and after many messages, I believe they closed the case without doing anything. I am angry with what I believe is a fraud-like act.