BB Curve :: 8520 Lists Only Phone # For Some Contacts?

My 8520 has done this since it was new (now 1.5 yrs old), and I'm sick and tired of it. When I get a call or text from someone on my contact list, about half the time it only shows the Number but not the Contact Name. This is very frustrating b/c I obviously don't have all my Contact numbers memorized, and so don't know who is sending me a text or phone call (this is especially annoying while texting!!!)I've talked with my service provider multiple times and they have tried to help, but say it's really an RIM issue and needs to be address by them.