The phrase "exemplary customer" is correct and can be used in written English.
You can use it to refer to a customer who goes above and beyond what is expected in terms of service or satisfaction. For example, "We have been fortunate to have had many exemplary customers over the years."
Mayra Morales-Laurent has consistently demonstrated exemplary customer service over many years.
I had numerous discussions with printers until I found a gem of a firm with exemplary customer service.
"The feelings about having to do that are still very raw, but over that same period of time we have seen innumerous awards for exemplary customer service".
The company seduces customers through low prices, prompt delivery, an ever-expanding array of services and products, and exemplary customer attention.
Known for his commitment to providing exemplary customer service, Anton works diligently with his team to ensure maximum comfort for building occupants.
With 1.4 million customers and an annual revenue of 4 million dollars, social media service Buffer has grown by introducing useful products and exemplary customer service.
At the start of January they wrote to the bank to point out that they had been "exemplary" customers for decades.
Exemplary customers for Global Crossing have global reach: financial firms, governments, high-tech and manufacturing multinationals, and infotainment conglomerates.
If many elements of a business are exemplary, its customers will have high expectations for an ongoing level of goodness - and the instances of poor or indifferent service or product quality will be even more jarring and off-putting.
Southwest Airlines makes a strong statement about its values both internally and externally, and the resulting exemplary corporate culture and customer service are the gold standard for companies around the globe.
Always treat your customers with exemplary kindness and respect.
