This number is always disturbing and i want the line to be blocked off please ,

No one here can do that for you! You can report it 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/

Not sure if a call blocking device would work for you, but consider one..