Unapproved Debit Taken

I have a Credit Card with Capitec and agreed to a debi check each month on the last day of the month for payment. The last 3 months they have debited on the 25th and this month on the 21st. This is simply unacceptable as on each occasion they are taking money the moment there is money in the account. Not even my Salary just simply money grabbing. I am reporting this to the NCR. This ****** bank does what it simply wants as I never signed or agreed to any other debit date but the last day of the month. The moment this account is settled I am closing and NEVER again going to do business with this bank.