Phone contract

I took a phone contract from Vodacom. On the contract I was told I'm gone pay R219.99 for airtime and is free 1GB. When the package arrived it had 2 simcard, I called vodacom to ask why 2 simcards and they told me that 1 is for airtime and the other 1 is 1GB and it's on promotion they can't put them in one simcard.

I was OK with the explanation. When the debt day arrived they R125, R548, R220, R220, R220, R296, R296, R309, 313, and etc. They've been deducting different amounts of money in my bank account and I've been asking them since January to stick to the agreement and deduct what we agreed on. And they told me that they are charging me for the 2nd simcard.

I even asked them to cancel the 2nd simcard and stick to the agreement and also refund me those extra money they have been taking. Yesterday 20 June 2022 they told me that's not gonna happen and it was on promotion when I took.

When I threaten to reverse the money they told me it's gonna be bad for my credit.

I'm drained, I'm tired and I don't even enjoy anything because of this situation. For June they sent a statement that says I'll be R313

Can you please help me. I promise I will never taking anything from them again.