I'm so glad this in now being investigated and I do hope they reprimand and dismiss this individual and perhaps legal action persued.
There is always a place to go for further complaints. First ask to go to Dispute Resolution and from there let them know you will be going to the Telecommunications Industry Ombudsman. Any time an ombudsman has to get involved in complaint resolution will result in a cost to the Telecommunications company. They will want to avoid this as it costs them win lose or draw and a lot more than fixing the problem in the first place.
Jadey