By law they CANNOT call you at work

by law they CANNOT call you at work once you tell them that they cannot call you at work. Next time they call tell them that they can not call you again, and if they do you will be contacting an attorney and the FCC and filing a complaint. This is true, but you have to put your request in writing.

If you tell them by phone not to contact you at your workplace it is only good for 10 days, in which case you send a letter within those 10 days to make it legal.