Boots not delivered

absolutely disappointed with Mr Price's service, ordered boots that were marked down to R50 (11 pairs); the order went through, amount deduducted and stock was confirmed to be available, only for two pairs to be delivered. the order still has 11 pairs on it, one pair that they are saying is out of stock i subsequently ordered after the first pair but to be delivered to a store and that one miraculously is in stock. my gripe is that why did it take them 5 days to realize that they do not have stock? really unfair and disappointing service from Mr Price Online im never buying from them again!