Hi there, @Halstep !
Sorry to hear you’re facing this difficult situation.
While we’re not able to confirm if a given store is using Shopify, it should not be the case that a Shopify store would have access to your full card number or be able to withdraw more money than the price of the order you have confirmed you wish to make with that store.
I would advise you first to reach out to your card issuer, bank, etc in order to let them know what has happened and that you believe you have been charged incorrectly or illegitimately
If you believe the store you ordered from to be using Shopify in a manner which contravenes our Acceptable Use Policy, you can report an issue with a merchant using this form.