How Celcom upset me!

I went outstation recently and my mobile phone was automatically on international roaming mode. I overused my limit and because the bills ends every 28th of every month I decided to wait until the evening of 28th Aug to make online payment. I borrowed my daughters phone who is on prepaid. However, I paid my bill on the 27th instead- RM314.00 an amount I confirmed with customer service by calling the Care Line. But still continued using my daughters phone until the 28th so I'd have a 00.00 b/f account. After making the payment, I called Celcom to informed them I've made the payment. The customer service asked for the reference and I gave him an 11 digit number with the letter 'x' in between. And he can tell me he does not want the 'x'. I then told him off saying that this is the reference number and if he refuse to accept it and continue to bar my phone, I am complaining. He accepted it immediately. My telephone line was realeased 4 hours a after - 28th August. So I only started to use my phone on the 29th. But my story does not end there.
30th Aug - 8pm, Celcom barred my line again. I didn't know this until I was trying to make an urgent call. I call the so called 'Care Line' and they confirm that my phone is barred as I have not settled my bill. My blood shot high up immediately and request them to check again. I was so furious and upset. The customer service put me on hold and when she returned she confirmed that I owe RM255.65 for August - I then with a harsh voice said that I settled my payment, giving her the history. She then put me on hold again. And when she returned she said I have another oustanding of RM58.35.
I asked her what happened to the RM314 payment I made? If Celcom said that I owe RM255.65 for August- RM255.65 + RM58.35 outstanding, isn't it amounting to the RM314.00 I paid on the 27th August.
Even if I owe RM58.35, my credit limit is RM150.00 - why the hell did Celcom barr my phone line? the customer service said that it is the system that sets it that way and I told her, the system is created by man and can be changed or updated by man. In this case, it should have been updated by the 28th August when I made that call to inform of the payment I made. The customer service could not explained any further but immediately said she will released my phone line. Still furious, I apologized to the customer service that she had received my frustrations on this, told her that this is not the first time Celcom frustrates me and asked her to speak to her management.
Celcom - you may have the widest coverage in Malaysia, but your system and services sucks. You are really taking advantage on users who are perhaps mostly ignorant. I am beginning exercise my choice and rights!