> I definitely want to say something, but not sure how to broach it, This is the key part. What do you really want to achieve? 1. Win this client - make them

> I definitely want to say something, but not sure how to broach it, This is the key part. What do you really want to achieve? 1. Win this client - make them love both your product and your company and turn them into paying customers? 2. Admonish this client - let them know that they did wrong and that they should correct their "bad behavior"? You have already made a good impression - your product is useful for at least 2 people in this company. So you can reinforce this positive experience by demonstrating that your customer care is as good as the product itself. My suggestion: grab the phone and call those 2 guys who are already familiar with the app. Ask them about their experiences and willingness to continue using it. Diagnose possible barriers, doubts, needs etc. Just show them that you are awesome. If they are really abusing you, you can always send them cold, corrective email later. It actually won't change much, but it will make you feel better. Good luck!