Clicks changed my order without my knowledge

I ordered 2 bottles of 100ML English Blazer black on clicks online on the 25 October for R280 and took a screen shot of the online order. I collected my order in store only to find that they delivered 2 X 50ml instead. I queried this with clicks who said that I had purchased 2 X 50ml not 2 X 100ml. When I went onto my online profile today (1 November 2024) I noticed that they had changed my order to reflect 2 X 50ml. This amounts to ***** where invoices are changed after the fact. I have screen shots of both instances to prove my claim. Shocking from a big retailer like clicks. They have also contravened marketing/advertising codes apart from commercial law