Why was Synchrony Bank sued?

chase banking 21 Chesterfield State Bank 3 Eclipse Bank 7 ESB Financial 18 FARMERS & MERCHANTS Bank 2 FIRST AMER Bank 3 FIRST CENT State Bank 4 First Freedom Bank 3 First National Bank of Fleming 10 FIRST RESOURCE Bank 6 First State Bank of Malta 16 Great Rivers Bank 13 Guaranty Bank 7 Madison County Community Bank 2 Oklahoma Capital Bank 5 Preferred Bank 1 UNIFIED Bank 4 VERMILLION State Bank 9 VIRGINIA National Association National Bank 7 WESTERN ALLI Bank 15