Who called from 8643264994

Got this call on my cell phone (t-mobile service) and I answered the call..No reply on the other line. Hung up.

Call from this number...on cell...did not answer.

Did not leave message, when I called back, it says only  please press ant digit to be placed on do not call list. They did NOT identify who they are. I pressed one, got a busy signal. Tried again using 9 as some have mentioned here, again, just an immediate busy signal.

yet ANOTHER call for some sort of home security thing, they call from different numbers nearly every day and clog up my voicemail.

Received a call @ 3:54 at workon my cell. Didn't answer, didn't leave a message. I called back the number using my work phone which will not be traced to my extension.  After a few rings, recorder said to hit any number to be taken off the calling list.  I do not trust them!