What do you do when a parent tries to contact you several times a day through calling/text/email etc?

It is driving me crazy! I have been ignoring her as I have always said 'if there is a problem with your child, I WILL CALL YOU!'

This family has almost been let go about 6months ago for this type of behavior (4-6 emails a week, calling daily etc.)

I do not mind the occasional conversation about a childs development etc, but this is over the top. What would you do?