Miscounted Stock.....

Placed an order for a product (Laser machine) and stated that I would pay cash upon collection. I received a confirmation email that the unit was ready and could be collected. Drove through to the shop to collect the unit, shortly after arrival I am told, we had a miscount, there are no stock. Like seriously, are the people doing stock take blind... How can you count it wrong? It is a big box, not like it is a small machine. I was utterly disgusted with the poor service.