Overcharged Account

Good Day

When I took out your contract telepathically, I was promised that I would pay R299 each month and R9.58 for caller identification. The first month I was debited with the incorrect amount and my nightmare started shortly thereafter. I battled with you guys for several weeks to debit my account with the fee we both agreed on. You fixed the problem and we continued doing business ever since, which I'm thankful for. This morning I got a notification that my account was debited with R323.99 and I was expected to pay R308.58. I called your call centre and they mentioned that your pricing went up. What the hell does that mean? Does this mean at any given month, you can debit my account with any amount you want, and I should accept it because your pricing went up? This is absolutely madness!

Please credit the difference of R15.41 and correct my billing for next month.