Disappointed customer

I placed an order for a Nike tracksuit that was on sale and to my surprise only the top was delivered, I made contact with Superbalist and was advised that an exchange will be processed, and only if they don't have stock they will make contact with me and I can get a refund. The tracksuit top was collected and they did a new order for me... I was impressed at this stage that my query was being resolved so quickly and professionally. Then the new order came and they only delivered the pants!!! Called the "client concierge" again and was told that the item has been placed on hold due to stock issues and many logged queries. How can you get this so wrong, it was a simple issue to correct and not even that you could do well? How do you disappoint a customer twice??? I will definitely never order from Superbalist.com again!