Ineffective inventory management system

Dischem online shopping has to be the worst online shopping platform I have used. I have placed orders twice , order accepted/ processed by store only to find out a few days later it is out of stock. Whats worse is that its not a low stock item, it’s completely hasnt been stocked in the stores for a month however still shows available. The staff that call to notify of the error are not really helpful, they cannot tell you anything, give you guidance or tell you what is wrong. I have asked both times to speak to managers but I guess they are too busy to talk to customers.