Extremely rude

Very rudely and unhelpful. I wanted to query the an R8000 increase in my monthly electricity bill. When I was helped by customer service: 1) Very difficult to hear due to barrier. 2) I enquired about my massive electric bill, the consultant looked at my printed invoice, pointed to the billing period and said "That's why", I asked how two months can accumulate to such a large amount amount, he rolled his eyes and exhaled, displaying obvious irritation that he has explain the situation. I'm sorry for bothering you for you too actually do your work. His explanation was quickly mumbled off. I was polite and sincere, I don't know why I deserve such ********** attitude.