Don't want to work for the owners??

I have a couple that I kind of got a kinda weird feeling about, but watched their kitties one night about a month ago. They just requested I come again. I'm really not up for them needing to have another hour long sit down (which she said they will want), and the calls and questions they have the following days. Things like "how much food did you give them" or "we'd like to sit down and go over everything" or "can you remind me how they behaved". we went over all of that while I was at the stay. I literally went in, fed them, sat down for a minute, and left. And it was so much communication with them for the following days, until I just quit responding. not to mention some weird things. Anyways, not worth the stress and time for what I charge for a visit. So, the question is, how would you let them tell them no? Of course I don't want to be rude, but I also don't want to just tell them I'm not available.