For the majority of businesses, especially entrepreneurs of small businesses, your clients are your bread, butter, and jam! And this should never stop being the case. They will be fun to deal with at times and at other times, quite difficult. You should always interact with them with as much planning in advance and as cool of a head as possible.
This is going to require some preparation on your part. This collection of products has done most of the heavy lifting for you. These letter templates will you started in the right direction. Tweak them to your needs as needed but they should be much. There again saving you time and effort!