Cannot navigate around their own business

Navworld is one of those businesses that use fictitious stock levels on their online shop and then after the order is placed it changes. I place the order based on the fact that their site clearly states IN STOCK. When I get an email after I paid to say that an item is on backorder I tried to contact them on two of their known email addresses but get no reply or even acknowledgment. So after being given the virtual middle finger I spend even more money to phone them. Their Pretoria number does not work and the person in JHB cut me off within 3 minutes. I phone again and not once is an apology offer up for the utter lack of service. I just ordered the same item for R100 cheaper from DBN, deliver 1-3 days. Navworld delivery from Randburg is 7-10 days.