CPT Metal Castle and Fiesta - Bad Customer Ethics

I don't like *********** and lying shop assistants, and it looks like this company has those kinds of people in stock. I placed an order for two items in December, placing my order over the phone. I was given the prices of each of the two items via WhatsApp line as I was communicating with one of the shop assistants via what's. It was torture dealing with this person, but eventually I was asked to pay a 50% deposit fee before an order could be processed. I paid ( that was in mid-December last year). I was assured that the items would take a week to arrive but I waited until first week of January in the new year when I was suddenly told that the price of one of the items went up by more than double the original amount (from R1230.00 to R2480.00). This is against the law. The Consumer Protection Act makes this conduct by private companies ********. I should be charged the price quoted to me, at the time when the transaction took place, not a new price that came after the transaction was already concluded. I was asked if I still wanted to proceed with the transaction or not. Of course I was not willing to pay more than double the original price of the item. Also, I was expecting to have received my order in December already, as promised. Instead I was being informed that the price has gone up in the new year whereas I had placed my order in December last year and I was assured that delivery would take place in December last year. This constitutes bad faith commercial practices and ethics towards a customer.