Angry customer

Hi Please assist, yesterday I went to vodacom waterfront in Bloemfontein to a Samsung S21, on display it shows that its a dual sim, I bought it en went home with it when I got home I noticed that it's not a dual sim, I went back to vodacom to explain it en ask if I can get a dual sim because I work from home so I use one sim to connect to work and there other sim card it's my personal simcard, the manager than told me that they can't assist me because there's nothing wrong with the phone en I was supposed to say that I want a dual simcard so now this phone it's a second phone, she **** explain about bread which was unnecessary and she was so inpatient with us, am very angry and disappointed because I need to work on Wednesday my old phone it's giving me problems