I'm setting up a cat sitting business as a sideline, initially, but I want to grow it.  In my day job, someone sent out a global email asking if they knew a cat sitter, and one of my colleagues passed on my details and website link.  The woman emailed me, very positive, saying she wanted 3 weeks August/September and 5 weeks next April.  I said I would go along and meet the cat.  I heard nothing more and contacted her today, and she said she was "sorted, thank you".  I believe she didn't want to pay my charges.

Also when I was putting together some marketing flyers and researching vets, pet shops and groomers to advertise I found another one in the same area as me - much longer established.  Looks very professional, full of testimonials, links, and so on.  My cost was £1 less per visit. 

How would you, if you were me, make this positive and get the outcome I want?