Disappointing experience

I went to MTN Cape Town, Century City about 5 days ago to renew my contract. I was a bit indecisive about what I wanted and asked the sales representative if they have a Samsung S21 5G in stock just to see if I like the phone. She brought out a demo model, I held it but had mixed feelings. We then discussed the difference between S21 FE and S21 and I mentioned that I would choose the S21 and continued to look around while she did my mother's contract.

I then decided to take the Huawei P50 Pro, but she already rang up the S21 and added it to the account... I never gave the go-ahead or even hinted that I wanted the S21, I asked if we can change it and she said: "no, it's already on the system."

Now I am stuck with a phone I don't want for 3 Years! And I am very unhappy with this phone. The battery doesn't last at all, I have to charge like 2-3 times a day. I went back, and they said they can't help me with switching to a different phone, but they can replace it with a different S21 as it is in the 7 Days. I replaced it, but this one's battery health is at 91%, it's 1 Day old...

As a local MTN customer for years, I am really really disappointed! I am now stuck with a phone I do not want and cannot change.