Going against advertised deals! Not honouring advertised prices!

Black Friday Deals at Exclusive Books in Sandton City. I have to say what a load of *******. Complete and utter *******. I pop in often, unfortunately I can not buy often. Due to the economy and especially Covid. Today being "Black Friday" i thought perfect chance to get a book or two. I do so enjoy reading! I did not even see the 75% off sign. I saw sale, and went to look. I see 30% off, okay not bad; but more than I can afford with current state of affairs. Then i saw the sign. 75% off already marked down price. I am elated. According to the sign take 30% off price, and then a further 75% off that price. So I picked three books, ones that I was really excited about( especially two of them). I even asked a staff member in store if the sign was right. The lady said yes, that what it reads as. So I go to the till, they start to ring them up. I notice that only 75% off the marked price came off. I enquire about this! Only to be told forget about the 30%, it is 75% off; by the manager( I asked for the manager)! So I point out the sign! Which says " AS ABOVE" 75% off already marked down prices! Now the manager is asking me if i want the books for 105% off. I say "NO, I am not asking you to pay me to take them; I want to pay the price they are offered at. Which is original price(OP) minus 30%, then minus 75%. So the one books original price was R859. Price should be R859- 30%(R257.70) = R601.30, now subtract 75% So final price R601.30 - 75%(R450.975) = R 150.325 ( rounded up R150.35) They straight up tried to charge me R214.75! That is a difference of R75 on just one book. What about the other two. I pointed out that what they are trying to do goes against both the " Consumer Act and The Transparency Act). Only to be told " If they do give me the price they advertised, then the manager said she has to put in the difference!" At this point I had had enough. I took photos of the books and their original prices, and of the sale sign ! ! And on top of this they mispriced one book, and tried to charge full price! I could not buy often but you have lost a customer and I will be looking to take this further, as it is complete and utter BUL####T!