What are SDN contacts and how do I get rid of them?

[AC Question]

At the last android update it seems that SDN contacts, 5 of them, were added to my Contact list.

How do I get rid of these 5 contacts: Client Care Canada, Client Care Int'l, Client Care US, Direct Assistance and TAXI.

 

[Rukbat]

That's probably bloat, put there by your carrier. They should delete the same way any other contacts do - long-press/Delete.

 

[openweb]

That's probably bloat, put there by your carrier. They should delete the same way any other contacts do - long-press/Delete.

I can't seem to get rid of them this way, or any way (unlocked Acer Liquid Z3, with an aftermarket prepaid SIM). any other tips?