You are not the only one who faced this problem - my husband's office also faced a similar situation, buying a few aircon units from Carrefour at promotional price, with promise of delivery in two weeks once the stock arrives. The deadline came and went, no delivery of stock, so the office calls up Carrefour and they were told the same thing - sorry no more stock, if you want have other models but at higher price. As they did not want to wait longer, they bought the higher priced units.
Sounds like it is a ploy to get you in a corner so that eventually you have to buy the higher priced units.
In a separate case that occured in February 2008, after an unpleasant incident with the staff at the technology section, I wrote a complain on one of the feedback forms provided at the outlet. Same thing - even though I asked for the Store Manager, the staff who spoke to me refused to confirm if he was the SM or not. I asked for a follow-up for what happened, even leaving my telephone number and email, but as you can already guess, I did not receive any follow up at all.