They spoof numbers so the answer to that is too many! :)  To file complaints, go here:

https://www.ftccomplaintassistant.gov/#&panel1-1
https://esupport.fcc.gov/ccmsforms/form1088.action
https://complaints.donotcall.gov/complaint/complaintcheck.aspx?panel=2
http://www.consumerfinance.gov/complaint/

hi this is scumbag with card services,  How many numbers do these guys have.

Usual scammy scumbags about lowering my interest rate - try to waste as much of their time as possible.