MetLife wants to end my benefits at age 62

I just got a letter from MetLife asking for disability information to send to their life saver unit. I have been on long term disability for 20 years. It was my understanding that my long term employment disability ends this month since I just turned 62. I will be receiving some pension from them. It is also my understanding that the group life insurance they paid my premiums on ends now too. About 5 years ago I contacted a woman at the department of labor about having to continually filling out these forms and sending them in every year. The woman wrote me back and said I did not need to keep filling them out since social security had determined I was unable to hold down ANY JOB; that I no longer needed to complete these. I sent that letter to them. I never received another request to have a physician complete disability paperwork. They sent me a claimant form for about a year or so then stopped sending them altogether. What’s up with this now? I live in the state of Texas. I just received this today and not had a chance to call them and ask why they sent it. The letter says I have 45 days to send this back. I found you by looking up “what is MetLife life saver unit” on Google.