The 2018 instructions for the Form 1099-R states that the issuer is responsible for correcting the any errors. Below is an excerpt from page 9 of the 2018 Forms
1099-R and 5498.
"
If you filed a Form 1099-R with the IRS and later discover
that there is an error on it, you must correct it as soon as
possible."
The 2019 General
Instructions for Certain Information Returns has also not changed the requirement for the issuer to correct any Form 1099 mistakes. Click this link Information Returns General
Instructions. An error chart is shown on page 11 that you can refer to when conversing with the company that issued the Form 1099-R.
