Unfair charge of R34 with zero balance

I'm writing to express my frustration with a recent issue. Despite having a zero balance, I've been charged R34. I've contacted customer care, but they were unable to assist and seemed unknowledgeable.

My concern: - How was I charged R34 when my balance was zero? - Why can't customer service resolve this?

Request: - Investigate this charge - Refund the R34 - Have someone competent call me to resolve this

I've been a loyal customer, and this experience is unacceptable.

Sincerely, Siphesihle