No stock and no response

I placed an order for some hiking boots on the cape union mart sale on the 27th of July. After a week of no communication I tried calling the number given on my order but no response. On Friday afternoon I received a mail to say they had run out of stock. I understand that this is obviously a big mistake and they must be stressing but I am now going on a 4 day hike this weekend and I have no boots, I have been trying to get hold of the online shop number to see if they can send me another type of boot for a similar value because I desperately need boots but there is never any answer. I live in the drakensberg so i cant just run out to the shops and buy boots myself so online shopping is my only option. I am feeling very frustrated and because what cape union mart has done is actually in direct contravention of the consumer act (specifically section 30) I am hoping for them to help me out but I'm getting no joy! I love this shop and I'm really hoping they will step up and help me go adventuring!!!