Website indicates stock but no stock

I wanted to purchase a deal advertised on Makro's website. The system indicates there is units left, however when going to the checkout option it advised you that there is no stock available. I called the call centre and was advised that there is problems with the system, however they transferred me to my closest branch. After consulting with the manager he said he still has stock left and that i should try online again. Still experiencing problems with my online purchase I call the call centre again and spoke to the supervisor. He said there is nothing he can do regarding my situation and even refused to call the manager of the store and try to help me out. I have to accept that I don't qualify for a deal that is still available on the website and displays there are still stock left. The store's still have stock left, but no one can help me.