Who called from 2159288000

They are calling over 5 times a day. I am on the national do not call list. I called them for their information now they won't stop calling me.

I am receiving unwanted/unsolicited calls on my cell phone and no message is left. So far today they called at 2:08p, 3:20p, 4:31p, 5:43p, 6:56p. I have not given out my cell phone. I saw mention of their association with Globe Life. I have policies with Globe but am considering cancelling them due to this harrassment.

This number calling 4 or 5 times a day = what do I do?  I keep deleting it.

Stop calling

I have received so many calls from this phone number I will not purchase anything from them due to this nuisance.