********* Behavior - Account settlement

I opened an account in February and the cashier that helped me forced me to take a sim card I didn't want nor need. I refused to take it but he said, you can't open an account without it. So, he put the Sim card in my bag and in my name without my knowledge. I saw it when I got home and threw it away. So, in March I was charged for it even though I sent an email to cancel it when I saw it appear in my statement and the worst part I got confirmation that it was canceled. So, when I went to the shop to settle my monthly fee I was charged for the Sim and advised that I canceled late that's why it still appears. So, I paid and later on I went to the store to confirm if it was really canceled and to my surprise it wasn't canceled so I spoke with Shaylin who then canceled it over the phone and confirmed that it's canceled and now my statement came again showing R49 for a sim I don't have or use. This is so irritating, ********* and I need this to be resolved because Shaylin even confirmed that I wasn't supposed to be forced to take a sim card.