Lingoda Automatically Renewed My Lesson Package Without My Consent

I purchased a 12-lesson credit package from Lingoda for $90. However, when I had only 3 lessons remaining, Lingoda automatically charged me the same amount again and added another 15 lessons to my account without my consent. As a result, the 3 remaining lessons were also lost in the process. There is no customer service phone number, nor is there an option in the app to cancel the subscription. Even when I click on the Help section, nothing opens. I have no idea how to cancel it. I have already sent an email stating that I want to cancel my subscription and receive a refund. I hope this issue gets resolved.