Don't use Standard Bank mobile, ********!!!

So I purchased a phone from standard bank. the offer came with a free simcard with a limited data and call amount. Now when I look at my statement , the bill is way more than what i signed up for. I contact the call centre and they tell me the card was preactivated with a data plan and they sent an email to this effect. My problem now is i did not sign up for any data and call plan and i shouldn't have to now have the admin of cancelling things that i did not consent to. It is ********** and false advertising. I did not agree to a data or call plan with standard bank and I want my money back and refuse to pay for something i did not buy. My 7 yo uses this phone and i had no idea it was on plan. I did not opt in on this, it is not fair to to that to your customers.