Capitec send me unauthorised debicheck to approve

Capitec keep sending me the same debicheck to approve after I declined. I don’t know who the credit provider is and have no business giving them access to my account. As a bank I’m sure they would have by now concluded that I don’t want to give anyone access to my money and am probably fearing for my online security at this moment but instead they keep sending the same debicheck by someone called FAST card to approve. Every time they ask me to approve a debicheck they also collect R0.40. This is so poor from Capitec. They are so big on sending people online security messages but when it comes to them actually providing online security they would rather assist the *********. Please correct Capitec, my account number is listed as the reference