Terrible customer service and false advertising

I seem to have been facing a similar problem with this online website, I order ,Pay and confirm and a few weeks into the event closing only after I call in and query I am told the supplier cannot supply the item For a company like Pringle to not supply shirts advertised ? I had to cancel the order, This time around it was the Cherry collection who had a promo Buy 2 for R299 Which is what I did I check for availability and sizes and confirmed and paid for order , After me calling in and querying the order I am advised that they do have the one pair and still waiting on the next pair,My response was its fine I will wait as I really want both pairs ,Then last week i receive an email stating that they do not have stock of the pair of Black shoes I order and they send a substitution request on a red pair of shoes, I already have shoes in that color hence the reason I ordered black and after me advising them I was told a refund will be done,Today I receive one pair of shoes delivered Great and then I check my account and I have a refund of R100.00 Now The special was R150 a pair ,How does this work so I called Runway and I am still awaiting a manager to call me back and explain to me how this is possible, How this is treating the customer fairly? I ordered and paid the company could not deliver ,The company needs to refund me the full R150 for the pair not delivered no R100 and charge me R200 for the pair I received I only ordered them because of the promo or I wouldn't of bothered, There are no ethics in TCF and someone needs to get involved a company cannot take money ,Keep it banked for almost a month and then confirm they do not have an item after been paid for it, Really upsetting, Something needs to be done about the way this website runs these offers