Waste of time and disgusting Service

Went to buy paint Saturday at Builders Express Greenstone as were in area. Chose colour in Modo range. They then advised that they did not have pastel base to mix it. Told them not to worry, will go to Alberton. Then said they can mix the colour but in the Duram brand which I agreed and bought not knowing any different. We ran out of paint Sunday. Went to Builders Alberton to buy another litre who advised they were out of stock on pastel tint of Duram. Couldn't complete my painting job. Went Monday to Builders Edenvale. They had stock of Duram pastel to mix the colour I needed extra of. They then said they can't mix it until I supply them the sticker and batch of previous mixture. Even though I had the colour card with me displaying the code. I then had to Call my wife who had to drive home to get a picture of this. Once I showed them this after waiting to get this from my wife for half an hour, then the next excuse was they are not allowed to mix a modo colour in Duram. I then said why could I buy this at other stores and not theirs. Why did Builders Greenstone suggest this but in their store they cant sell this to me? Their excuse was that it will break the machine. I demanded then to speak to a manager to be told his gone home. That was the answer and they were just not going to sell me what the other store did. Down right refused and Turned me away. So, I still can't finish my paint job. And waste my time while my wife wastes her petrol to drive home and get a picture of something which clearly they were not going to sell me in the first place. No stock in Alberton. Utterly disgusting, totally inconvenienced and still no paint that I was advised to buy originally! Do I have to go buy a whole new paint now and start the entire job over again just to get my walls completed?? What a waste of time and money!

Dumped my whole trolley as totally horrified and angry!