I took a 401k distribution, but have no 1099. what do I do?

I am 64. I transferred my 401 k fund from one fund manager to another, and had a portion distributed to me in that process from the current fund manager.  I have not received a 1099R for that distributed portion and when I contacted the current fund manager, they said that they do not send 1099R and that I should ask my tax person about how to declare the income.