A parent who assumes care well outside the boundaries of the contract, and then complains about the quality of that very care, and then demands meetings at specific times during personal hours, is EXACTLY why providers have to put phrases like "provider has the right to terminate at will" in their contract.

When a new parent starts badly and then escalates bad behavior rather than trying to understand the bounds of the contract, the provider must consider whether this parent may escalate further in front of children. It is best in my opinion, to discontinue the relationship immediately in order to avoid this.

And judging by the frequent calls with no messages left, this parent did continue to escalate.