I am pleased to announce that a positive outcome has been reached and all charges have been waived, a credit note should be winging its way to me as i write. Still not sure how this happened, wether it was a genuine clerical error. an over zealous employee or something more ominous i do not know. Thankfully i do keep my finger on the pulse as it were when it comes to invoices moving through the office otherwise it would have just steamed through the system with the hundreds of others i seem to get nowadays!
Thanks for your responses and opinions people, some interesting ideas there.
bye now...