No logic in pricing!

I purchased my current PC from Evetech and due to my then good service, I decided to purchase from them again. I am buying a Blackview mini PC kit with 251G SSD drive @ R8999. I can buy the same PC with a 1TB drive instead of a 512G at R9999. If I add ANOTHER 2TB SSD, it costs me another R2499. Speaking with Dane Harris (salesperson) he explained to me that when adding a 2TB SSD drive, the 512G or 1TB (included in the purchase price) is removed and replaced by the 2TB paid for additionally. In other words, depending which of the two options I buy with the added 2TB is irrelevant as I will only have the standard PC with a 2TB. I changed my order to the standard PC plus another 2TB (not installed) separately. Should Evetech install the second drive in the available slot, it will cost me another R299!! Does Evetech have any self-respect to do a deal worth R11 499 and still have the audacity to charge R299 to slip a module into an available space? Evetech, I am blushing on your behalf as I am a pensioner and previous client!