Mixed up orders

I have an order from Evetech where I order a laptop and they sent it via Aramex. Firstly the shipping inatructions was not added to the waybill, and then they sent me the wrong item. I received a gaming chair instead of the laptop. I called them earlier today to as them where my shipment is, and they stated it was still in the warehouse and it will be deliver on Monday (now Friday). To my surprise I received this shipment today (Friday) @ around 5pm. I told the delivery person that this was not my order. He asked is this my name and I told him yes, but on the box of the gaming chair I can see the order number and the order number on the waybill is not the same. Also there is a name on the box and it is not the same as on the waybill. This means they mixed up the orders at their warehouse. Because how can one person tell me that my order is still in the warehouse and the other one is delivering it to me. This is unexpectable.