Q: i'm trying to delete my debit card from my apple account i can nor, and they keep charging me for no reason.

The following may explain why you cannot change your payment method to None: Why can’t I select None when I edit my Apple ID payment information? - Apple Support

Also, if you are having recurring charges for the same amount it may be that you have an automatic renewing subscription. The following explains how to see your subscriptions and how to stop them: View, change, or cancel your subscriptions - Apple Support

In addition to the excellent information that FoxFifth has provided, if you are trying to remove the card, and make changes to the account, it will place a small hold on the card, like a $1.00, to ensure that it is still valid, as it would with any card you place on the account. However, those holds will be removed by your financial institution within a couple of days. You can take a look at this support document for an explanation about card holds. iTunes Store charges on credit and debit card statements - Apple Support  It is very possible this is what the charges are. If this is a recurring subscription though, the information link from FoxFifth is what you are looking for.