Dear DCP
This letter serves as written notice of our child care contract.
The last day I am available to provide services is Dec xx, 2018.
Thank you
NOT your provider any more
Short and sweet and no reason given.
I would not explain. It's clear you are not the right program for them.
If they push for an explanation just say something like,
"It's a business decision."
If they push more...
"It's business."
Rinse and repeat. You owe them no other explanations.