
When I worked for a Telco this happened to one of their customers in London
Calls that were hitting voicemail and then breaking out by dialing 9
The first time it happened after 6pm Friday until Midnight Sunday the bill was £5500
(All International calls)
After the monthly bill arrived we were called in to investigate and BT started to monitor usage
We found out the the voicemail was incorrectly programmed by the installing engineer
So for the whole month they had OVER £22K of international calls.
It's worth noting that the v/m was 8 ports and lines were ISDN 30 Channels
I'm not sure if BT let them have a discount or anything but our engineer was fired
and we think that he was the one who was exploiting the v/m and selling the info
Well he was a tw@t anyway
Can I have my coat please, it's cold in here!!