Emart Go-Rate Festa is a scam...

The Go-Rate Festa was supposed to start on October 1st.
I got the dates mixed up and went on September 30th,
and they were selling gold kiwis for 5,980 won (originally around 8,000 won) until September 30th. So I just bought one pack,
thinking I'd buy more tomorrow when the Go-Rate Festa actually starts. But when I went on October 1st, what on earth? The original price was 14,800 won, and with a 40% discount, it became 8,980 won?
The product was exactly the same as the one from the day before...