I retired from SBC Operations...now the name on my pension check is AT&T. I hired on with Pacific Telephone and Telegraph Company in Jan. 1971. PT&T was owned by AT&T. Retired from SBC just shy of 32 years.
You didn’t take a lump sum? Look at all of the retirement paper work you have or will get. It states that the plan can be eliminated at any time.
I have seen too many plans eliminted to not take the lump sum.
My wife started with Illinois Bell about that time, and has stayed through the many incarnations of AT&T, I don’t think there are many that have made it that long.