You can’t get two of the same subscriptions through Apple on the same Apple ID account. So, how did you subscribe in these two instances?
Payments through Apple are billed through the primary payment method of your Apple ID account. It would be highly unusual to have that appear split on two different payment methods, if you have enough funds/credit.
Peacock Free doesn’t charge anything, but has limited content.
Peacock Premium (with ads, $4.99/m) and Peacock Premium Plus (mostly ad-free, $9.99/m) will charge subscription fees until you cancel. Canceling will only stop later charges.
If you believe that you qualify for a refund for items bought through Apple, then you can request that as described on: Request a refund for apps or content that you bought from Apple - Apple Support