Last year when I made my annual "what discount are you going to give me for the next year" phone call to maaf I was pleasantly surprised to be told that it was going to be set as a permanent discount and I wouldn't need to phone the Customer Options team each year any more.
It's now 12 months later and I was checking my invoice for this month when I realised that it was much higher than usual. Sure enough the discount has been removed.
I phoned up Customer Services - they can't do anything as it has to be dealt with by Customer Options who only work normal office hours. I've therefore got to phone them again tomorrow from work (assuming that I've got time inbetween meetings).
So a warning - if you've been told that your discount has been set to permanent then don't rely on that actually being the case.
As far as I'm concerned, despite having been with the same ISP for a silly number of years (since dial up days with Freenetname) I'm now for the first time seriously considering whether or not it's time to move on.