I am writing to compliment you on your excellent after-sales service.
On 15 July I rang your office to report that I was having trouble with my double roller doors on my garage. That same day Ray called by and quickly solved the problem with some silicone spray and friendly advice. He was extremely helpful and I really appreciated having him call so promptly.
I also remember receiving good service a year or two ago when I had a problem.
Thank you very much and compliments to your staff.