Price change

I bought a set of underwear and bra’s..The underwears had a price tag of R100..however they scanned R120,I told the cashier that I’m going to pay the amount on the price tag,she called the supervisor or manager to assist with this,she came and asked if I wanted to pay the price that is on the price tag and I said yes,she told me that the bra’s price on the price tag is R160 however,when scanned it’s R130,she told me that I’m gonna pay the amount on the price tag and not the scanned price because I said that I am going to pay the price on the tag for the underwear with an attitude on her face