Incredibly bad service

My problem started off beginning April when I wanted to buy an awning from Campworld, in Bloemfontein, which was advertised on special. Here I was told that it could take four to six weeks as Howling Moon takes this long to supply. Why in the world would you advertise something on special if you cannot supply? I ended up buying another awning at double the price from Safari Centre in Bloemfontein. Towards the end of April '15 I order a side wall set for the awning and I was told it should take two to three weeks to deliver. It is now four weeks later only to be told that this product is only being manufactured this week! How can a large camping accessories supplier treat customers like this? To be honest, I feel like cancelling the order but where else do I buy as they are the only supplier of this product? I am seriously disgusted at this type of bad service we, the public, have to be contend with in South Africa lately.