Don't try and shop online at makro

I buy regularly from Makro but they have the worst website. You choose your items and put them in your cart-as quickly as possible, because of the lousy website. You go to check out and it says the items are out of stock!! Why do they not keep their website updated. I phoned their complaints number and the lady suggested going about it differently(ONE CART? )she said. That also failed. She checked and the PMB Makro DOES have stock-I have been on this since 8am and am hugely frustrated. This is normal monthly shopping-nothing special about it but their website is very problematic always.