Pick 'n Pay asap ********

I bough groceries from Pick 'n pay asap and used their voucher to get a discount and it went through. I then paid the balance with my card without a problem and my groceries were delivered. After 3 days they then deducted some money from my bank account without my consent. Equal value to their discount and not easy to notice. I just wonder how many people have they ****med like that without them even noticing. Of course I will never use their services again it's not the first time I'm having issues with them. My account and app has since been deleted.