worst treatment ever, staff has bad attitude and very disrespectful

I went to get a quotation for bulk of building materials (about R100k) at the Boitekong store in Rustenburg on Thursday the 2nd of August, then on Friday I made an order of + R7k for a portion of the stuff on the quotation which I needed to be delivered on Monday, 6th August (they insisted delivery can only be made the following Thursday regardless of my pleads to get them sooner). Then today, saturday morning 4th of August I made another payment for more things to be delivered (+R13k) all the payments were made through my credit card at the store. Then fortunately, as i was buying a concrete mix (which they don't supply) from another supplier I was offered a much quicker delivery on bricks, I immediately phoned cashbuild to request an order cancellation with full refund****erally less than 30min after I had made payment with them) I was told to come to the store to make the cancelation. When I got to the store ****erally 15min after the call) I was met by very bad attitude from the two ladies who were sitting by the quotations counter, and instead of cancelling the order as I had requested they cancelled all of my orders and threw me with the receipt without even confirming cancellation. My mom and I were literally treated like ********* for simply requesting a cancellation after we had decided to go with a supplier with better lead time. To top it all, I was told that to get a refund I have to come there on a weekday, with my bank statement to sign some forms (a very inconvenient system considering when they took my money it only took one card swipe but when they have to give it back its a whole process). I am based in Kempton park, i was there buying these things for my mother and even though i tried to explain that I am not able to come during the week and requested to do everything by email i was told that their cancelation system doesn't work by email, I will have to physical go to the store. seems a bit outdated, and I am sure there is a much easier and more convenient way to go about this. I have cancelled the order and I expect to get my full refund without a hustle just as they received payment from me without any of the hustle. the whole situation was handled badly by the stuff, clearly lack of customer care training combined with some entitlement and lack of common decency.