Debit amount error by Telkom affecting my business- Pure incompetence

Telkom debited an incorrect amount for my January payment an today i wake up to their message that my services are blocked due to payment reasons. I call their contact center, spoke to Zanele who clearly admit the error was on their side however, I must pay the difference! Why am I being held accountable for their incompetence as a consumer? I refuse to "just pay" as she said because this is not how businesses must treat consumers. Someone must be held responsible to avoid re-occurrence.

I have asked Zanele to escalate me to someone who can manage this matter for me and I have since been holding. This is pathetic to day the least! Meaning I cant run my business due to Telkom's horrible services!