"To whom it may concern,
I am from the Hibberdene on the South Coast about 100 km south of Durban. We had a problem with our TDDGT timer and phoned your Durban number for advice. A technician came out to inspect the timer and promised to come back and replace it. A few days later it was all done and sorted. Thank you very much for the prompt and fantastic service we received from your company.
I do not know the gentleman's name, but I would appreciate it if you would convey my thanks and appreciation to him for service which we seldom see on the coast."