*Canada, U.S. score highest ratings; Hong Kong lowest. LONDON, April 23- Banks have made little progress in improving customer service over the past year, with around a half of their retail customers considering switching to a rival, according to a survey published on Tuesday.
Jan 28- Bank of America Corp must focus on improving customer service as it moves past its crisis-era problems, CEO Brian Moynihan said in a letter sent to employees, signaling one of his strategies for boosting revenue at the bank.