Me suscribi a la prueba gratuita por 7 días y resulta que me cobraron 30 dólares en mi tarjeta de crédito..cómo hago para que me reembolsan.. alguien me puede ayudar porfa?

check your account, https://account.adobe.com 

does it show any subscriptions (eg, ai for acrobat)?

If properly cancelled, refunds are issued within 14 days.

See here:

https://helpx.adobe.com/account/individual/terms-policies-and-regulations/adobe-subscription-terms.html

and here:

https://helpx.adobe.com/manage-account/using/cancel-subscription.html

You need to have a valid form of payment before you can cancel a subscription and get a refund.

https://helpx.adobe.com/account/individual/billing-and-payments/payment-methods/update-payment-information.html