Poor online service and false adverti*****t

I experienced the worst service ever from the Bike Addict, Malmesbury branch and I hope I never have to deal with them again. I phoned their online sales (2/11) and confirmed that they have Shimano pedals in stock. I placed an order and pay for it (Tuesday) and by Friday (6/11), I still have not received the package. The Monday I phone again, just to hear that they do not have stock and are still trying to get stock, but they will phone me back. That Friday (13/11) I phoned again as nobody has returned my calls, the same story, still trying to get stock. I sent an email expressing my disappointment, still nobody respond. Monday (16/11) I phoned and asked to speak to the manager, he said he will find out what is going on and phone me back (still waiting for a call, 3 weeks later). Tuesday (17/11) I phoned again, again speak to the manager, he said that the stock will only arrive in the new year, but we agree that I will order the Ryder pedals and he transferred me to online sales. I changed my order to the Ryder pedals (advertised on their site for R440) and fill the amount that I have already paid with some other accessories to make life easier. The guy from online sales confirmed again that everything is in order, telephonically and by email. So Friday (20/11) my package arrived, without one of the items that I have ordered and they have invoiced me R610 for the pedals, that is advertised for R440. I immediately sent an email, confirming the delivery and also complaining about their service and still nobody has respond.