The Better Business Bureau gives Citi an F rating because it's received a high volume of customer complaints on the BBB website and it has failed to respond to many customer complaints.
https://www.businessinsider.com/personal-finance/banking/citibank-review
BBB is itself a scam organization, so...
F rating sounds perfect for Citi.
Made for each other.
F from customers and F from employees :)
To be fair, Wells Fargo also has F from BBB, Chase has D-, and Bank of America has an A rating with explanation "Government action(s) against the business" ... So, BBB ratings in particular should be read with a grain of salt