BB Curve :: 8520 Couldn't Remember Username / Password Combination For BIS

I was sent a new Blackberry curve 8520 as my old one broke, and am trying to set up my email accounts again. First, I couldn't remember my username/password combination for BIS. I rang my service provider several times and was told that it was nothing to do with them and that only Blackberry could sort out the situation. Well eventually I managed to get in to my email settings and set up two email accounts, however there was still one more I wanted to set up, but when I tried to log in again it wouldn't work! Even though I used the same combination as before. Using my username, I requested my password to be sent to me and it said it was sending but I still haven't gotten anything.