True Story:
I changed rates last fall and gave the notice to parents at drop off. At pick up, I had one dcm sit in my entryway with a super sullen look on her face. Then she got up, pacing back and forth... I'm sitting there thinking "wth, is she sick or something?", but no, she wasn't. She was contemplating what kind of spin she could put on my rate change to benefit her.
Then she proceeded to say "I just don't know what we're going to do", "I'd hate to have to find another provider", "this just isn't fair to us", "I'd hate to have to leave if we can't find a solution".
Over $3.
Yes, $3 -A WEEK. Less than the Starbucks coffee she totes with her every morning.
This was ultimately the last straw for me and I terminated services for
that and other reasons.
In your case, if it's really just money that the parent complains about, I'd put it back on them:
"I understand, and we can date your two week notice today since you're uncomfortable with my fees".