Incorrect billing and payment arrangement on my contract account

My account was incorrectly with an incorrect amount after I made a payment arrangement. My arrangement was for R2070 over 6months from 31 March 2025 but I was debited R3070 and also paid R345 cash after advice from the customer care consultant.

I asked that the arrangement be canceled or my balance refunded I was taken from Pillar to post and every consultant that I asked for their supervisor name would tell me about Popi Act.

Last time I spoke to a guy Sifiso Sibiya who hang up on me after he told me he can't escalate my query to credit management and he was unable to assist as he works at billing department as it's weekend.

He also gave me an incorrect email. address for me to lay my complaint about this incorrect billing issue.