"I'm writing to thank you and your company for the professional service provided when you supplied us with our new digital telephone system.
We are now able to field our customers' calls in a more productive manner and since the installation back in May I've noticed that our turnover has risen by 30%. I can only put this down to the way you have reorganised the way I use my telecoms.
It has been refreshing to deal with a company that really does put the customer first.."