Out of stock items

I'm not happy with Makro online, it's not the first time I used their services and I've been happy but this time around they did me dirty. I have a business and I stock my items at Makro yesterday I placed an order of items I need paid and the order was confirmed, but today I wake up to news that some of my items are cancelled because they out of stock ukuthi how did that happen I don't know cause out of stock items get marked before you can even add them. The painful part about this is that is going to be an extra cost to me in regards to bank charges when they refund and for when I try to find an alternative for those products, you know what is even worse and frustrating is that I'll get my refund in the next 5-10 days lapho I promised my clients that they'll get their orders Monday. I'm so hurt I can't even go look for those items tomorrow cause no I'll still not be refunded. I'm not happy you guys did me dirty having to go back to my clients to apologise and convince them to not go elsewhere, yhooo hai.