Can anyone from Orcon in here, help with a problem I have ?

Basically, I was billed for an 'Installation fee' when they did an upgrade to a cabinet I am connected to and now use Telecoms line but get billed by Orcon. 

I spoke to someone on the phone about it and they said it will be fixed ... 2 weeks later nothing has been done about it and I get a friendly reminder from the Credit Services about an Outstanding balance.

My acount number is ******* and any help will be most appreciated .

(Mod edit : Removed account number - XPD)