Utterly disappointed and frustrated

I would like to express my utter disappointment and frustration for the distribution of my last order.On 26.05 I purchased a product from Groupon as I needed the product by 05.06.On 27.05 I received an order confirmation email.Only on 03.06 did I receive an email that the order has been dispatched and received a tracking number.On 05.06 I contacted the courier company to find out if the product would be delivered by the evening. They advised me that the order had been cancelled due to no stock being received. Why send a tracking number if you know that there was no stock for that specific order? I then contacted Groupon to find out what was happening and was issued with ticket number ***5 which a Bianca dealt with. She advised me that their product team had contacted the supplier and the supplier advised that they delivered short stock to be sent 08.06. The deal is still open so how could short stock have been delivered? I contacted the courier company again 08.06 and still they have not received any stock. I have been contacting Groupon on a daily basis but no one can tell me when my order will be delivered.I have purchased from Groupon in the past and never had this problem