Many publishers commit in words not writing. As author or illustrator consider yourself the best sales person for your book. Passion sells volumes over a publisher's promises. Upon release, publishers should provide a 3, 6, 9, 12 month marketing plan for book sales. A plan commits all parties in writing.
If this isn't the case, create a plan immediately. Infuse your marketing ideas into the book's success. Especially when the publisher hasn't!
Critique the publisher's professionalism. Are edits professional (typos, misspellings, etc.)? Do you have a professional layout (margins, text flow, etc.)? Were professional illustrations used? Place your book on a table with books of similar content at the library. Is the book reviewed, read, or overlooked? Make notes of people's responses.
The goal is to share your story. To be considered professional expect professionalism from everyone on the team. If publishers aren't following through, evaluate whether the company is the best fit for your business goals.
We've all had bad experiences with a project or team member. The experience teaches us to give in or become better business people.
Award-winning Illustrator of Nicholas, that's Ridiculous! A Story About Being a Boy