Citizens Bank, National Association, is regulated by The FDIC.
Here is a link to file with them, you may file anonymously as well.
https://ask.fdic.gov/fdicinformationandsupportcenter/s/?language=en_US

As far as their broken mobile app goes…
https://play.google.com/store/apps/details?id=com.citizensbank.androidapp
Here is a link on how to flag it via Google Play Store.
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