Not honoring an advertised price in their catalogue

After my son's phone got ****** during a house breaking, I was looking at replacing it with a prepaid one and then doing a sim swop in order for him to use his contract number again. Being a client of MTN for 16+yers with 6 active line with them, my obvious choice were to buy from MTN. I browsed their October Y'ello catalogue and found the perfect phone, which had decent features and were affordable with a listing price of R799. Great was my disappointed when reaching the Paarl Mall store, only to be told that there were an error in price, after I queried the invoice while I was busy paying. The assistant contacted their regional manager Theo Albertus, which told them it was a printing error and they should not honour it. I could not contain my disbelieve because according to knowledge the Consumer protection Act requires all retailers to honour a advert even though it's wrongfully printed. In the light of the above, I will surely be rethinking who I will be choosing as my service provider comes the time my six lines are due for an upgrade.