Ash here from the Shopify team. Welcome to the Shopify Community!
I'm happy to help you out in this situation. It sounds like you had the Shopify Plan ($79/month) selected when your trial period came to an end, causing you to be charged the first months subscription fee. I can definitely appreciate that now may not be the best time for many to start up an account with Shopify, so allow me to take a closer look into your account with you.
I've sent an email to the email address associated with your Shopify Community account. Please reply to that email so that I can authenticate you on your account, and then I'll follow up with the next steps for us to take.
I totally appreciate where you're coming from. In order for me to look into your account, we'll need to get you authenticated first. Can you please reply to the email I sent you so we can determine the best next steps to take?