Bad service

I'm not happy with their service I went to pep in golden acre cape town on the screen the phone was on sale Samsung A06 it was 1600 but when I bought the phone with their staff they say the phone not on sale they give me with normal price where as on their screen the Vodacom phone it shows that it is on sale I ask them how come they say they don't have sale anymore I bought the phone because I really need it.