South Korean consumers found local coffeehouse chain Hollys Coffee to offer the highest level of customer service, the best products and the most favorable impression, an industry survey showed Monday.According to the survey conducted by the Korea Consumer Agency on 1,031 consumers who had visited the country's six major coffee chains -- Starbucks, Angel-in-us, Ediya Coffee, Coffee Bean, Twosome Place and Hollys Coffee -- Hollys Coffee received the highest score for overall satisfaction wi