Late deductions from my account

I am struggling with late deductions from my Standard Bank account? I swipe my card at Spar and every time the deduction only goes off my account 1-2 weeks later, yet I immediately get the SMS notification. This only happens when I use my card to pay and only at Spar (I've tried 3 different Spars). Surely I can't be the only one? Can Standard Bank investigate this? Because the Standard Bank call centre has called me before as a result of my account going over the limit. But it's difficult to budget correctly if I am not aware of the money not going off my account. So I empty my account and a week later the Spar deduction comes off. This is truly frustrating.