Monthly payment stopped but they are the one's on the wrong side

Metropolitan sent a message about my living annuity that I need to fill in a proof of existance form I received a message 2 days before my monthly payment. They stopped the payment without even sending that form to me. Usually they send the form and give me 30 days to send the form back. Now I am dissapointed they stopped my monthly payment but it's their mistake because I received no form yet my money was stopped.