This was a pornographic call that one of my children answered. Only got a recording asking for my credit card when I called back so can't figure out how to stop them from calling our phone! Very frustrating.

Report them to your phone service provider and see if they can block them. Also file reports here:
https://www.ftccomplaintassistant.gov/#&panel1-1
https://esupport.fcc.gov/ccmsforms/form1088.action
https://complaints.donotcall.gov/complaint/complaintcheck.aspx?panel=2