Zara Misled Me by Falsely Marking My Order as In Transit and Then as Returned

On November 28th, I placed an order for a total of 9 items during the discount campaign on their mobile app. A few days later, I received a box containing 4 items. When I checked the tracking panel, it still showed the remaining 5 items as "in transit," so I waited for their delivery until today. However, when I rechecked the tracking panel this morning, I saw that at 01:01 AM, the status had been changed to "returned." Now I’m trying to reach Zara’s customer service, but the only way I can communicate with them is through their website’s help panel—a frustrating and ineffective system. They told me that the 5 items were marked as returned because the courier company was unable to deliver them to me, and that these items are now out of stock. After lengthy discussions with the courier company, it became clear that Zara never even dispatched the package containing the remaining 5 items. There’s no record of such a package in the courier company’s system. This proves that Zara falsely showed the items as "in transit" in their tracking panel, only to later mark them as "returned" and blame the courier company, which is a blatant lie. Due to Zara’s lack of planning and inability to supply the items, I am now left without the products I ordered. As a consumer, who should I hold accountable and file a complaint against for this inconvenience? In my opinion, it is undoubtedly Zara, part of the Inditex group, and I doubt I’m the only person to experience such an issue, as their strategy seems quite calculated. This raises the question: how many people like me have they inconvenienced while using our money for days in the process?