Shopify complaint: Tricky automatic drafts after trial period

Charged 80 dollars for a membership I was not even aware I had. I am still not sure what shopify actually is but. for some reason one night I started a free trial and I usually keep up with the free trials throughy I tunes. Usually cancel the same day of starting trial. But shopify doesn’t show up in I tunes I know that now after being charges 39.99 twice. It is pretty obvious that this was a mistake, because of fact I only logged in twice to the app, the day I started trial and the day I found out about charges. Upon contacting Shopify which it seems to be a multi million or more company it is sad that they still try and profit from tricking with free trials am auto renewals. So aggregated with this company and there needs to be some kind of legal action taken against deadbeat companies that are stll using this trick to scam potential users!