MTN SHOULD REFUND ME NOW!!!!!SO DISGUSTED

I am an MTN User for more than 20 years. I have stayed loyal to them during very bad times but now it is the limit. A debit order went off with the wrong amount. It was probably R100 more than what should have been debited. I called MTN and spoke to a consultant who is doing their job. He said they have billed be incorrectly and then he said hold on let me send a request. There was no apology from MTN. MTN does not cater if that was the last 100 I have in my account. All they do is debit incorrectly and not even apologise. Where have your ethics and morals have gone to not even say sorry to someone who is your customer.