can call it theft using the tills/billing systems

They have some buy 3 , cheapest free. I took one of this 3, and was charged normal price, no discount/savings for it. I purchased aerosol sprays(Axe) 2 for R56 , it even shows the discount, I paid then got home to look at the slip, I have been charged R140 extra over the totals , even if they had charged me regular price for all of those, it works out to R140 overcharged, They must be robbing thousands of people such , and most people don't check their slips anymore