Exchange Dissatisfaction

Good day.

Just would like to express my outmost disappointment and frustration dealing with Replay SA. I bought items on the 24th Nov before the actual Black Friday on Sale and received them on the 26th, upon receiving them i realized 2 items from my orders were small, immediately logged an exchange for larger items and selected new sizes, but i did not get a response, followed up with an email to check status 2 days later, only got a response after the sale had ended after Black Friday that the items i selected were out of stock but when i logged the exchange on the site there was still stock. I was told i need to choose different items but i would loose the Black Friday discounts and will need top up. I find it very unfair and prejudice that they conveniently came back to me when the sale had ended and now i need to pay more. I asked why cant i choose items of the same value and apply Black Friday discount as i was eligible for discount having logged the exchange within the Black Friday period or wait for those items to come back stock but they refusing and insisted that i choose new items of the same value of the discount or get a refund. This is very disappointing that they ignored my exchange while they were focusing on pushing sales and ended up running out of stock. I even argued that the same items and sizes i have someone out there might also be looking for them. Very disappointing