Orcon has tried to overcharge us twice now. First time was after we upgraded from 30GB to 60GB. The change was suppose to take effect at the end of the billing cycle, but at the start of the next billing cycle when I logged into our account and it still said we had 30GB. I called Orcon and was assured we had 60GB and it was just a minor error on their website. But then at the end of that billing cycle we had used up 55GB, and when we received our bill it said we had used an excess of 25GB. I called up Orcon, and at first the guy tried to tell me it was a valid charge, so I had to explain it to him a bit. Once he finally understood he said he would fix the problem by crediting our account.
So he fixed the problem and on the website it now said we had 60GB. However later we decided to upgrade to the 200GB plan, and they tried to overcharge us again. So after we had requested the change, I logged into our account at the start of the next billing cycle and it said we now had 65GB. I sent Orcon an email warning them that their was an issue with their system again and that they better not try and overcharge us again, but I didn't waste my time calling them, because I knew they were probably going to try and overcharge us anyway, so it was better to just wait until the next billing cycle and then ring them then.
And just as I expected, they sent us a huge bill for using an excess of 125GB. I called them up today and got it sorted out, but I had to wait on the phone for a while. The girl just told me that it was a system error. Maybe one day they'll fix it.
Now the scary thing is we usually don't check our Orcon bill, because we have an automatic payment set up. If we hadn't checked it these last few times Orcon would have gotten away with overcharging us by about $300. I'm wondering how many people they have actually ripped off so far, because it looks like they will only refund you when you notice the error in your bill and report it to them!
Anyway, we will definitely be leaving Orcon when our contract is up.