Horrible service

I placed an order on the 8th November for a Trolley Inverter ELLIES system 720W 1200VA. I checked stock, this was an instore promotion, there were 7 units available. I put in my order. Payment was made for both unit and delivery, but the address had been incorrectly autofilled to Free State. I changed this twice by email with Nosipho to Gauteng. Now 8 days later with no communication from you I phone to find out where my order is. Surprise, surprise - no stock, but I can have a bigger one at double the price. What kind of sorcery is this? No stock is not a problem, but don't tell me there's seven in stock, then say nothing for days after I've paid in good faith? You still have my money - make a plan about the stock. Update, I phone again. I talk to the supervisor. Not to worry, I can have the demo model which hasn't been touched. I ask for an email confirming I'll have the same guarantee. Still waiting a day later.