Send a letter to the CEO saying something like “FYI, you should really hang onto $PERSON. They help me with $THING. I’m telling all my friends about $COMPANY.

Send a letter to the CEO saying something like “FYI, you should really hang onto $PERSON. They help me with $THING. I’m telling all my friends about $COMPANY. I thought you should know, too.” For extra impact, write it by hand.