Got a call from this number and the connection was bad, so I could not hear the other person.

Then I called back and learned it is an international calling number. Either a calling card or aspecial plan that gives free or low cost international minutes. Since they offer the option to continue in Romanian, therefere I am assuming it was my son whi is temporarily there.

If you get a call from this number, think of who could be calling you internationally. An I would encourage you to answer, as they are your relatives or friends trying to reach you. If the connection is bad and you can't hear them, at least say something about the bad connection, in case they can hear you.

I'm having the exact same issue with this company. They r calling me from several numbers. The # u have listed has just been used. I've been blocking their different phone #'s as they call. Actually, what i'm doing now is calling back and screaming (as loud as I can) into their ears to stop calling me. When they call, I just scream so much into the speaker.
I've complained to the donotcall registry, but so far no luck! It doesn't help when they keep changing numbers on you. These idiots just don't want to stop it.

They are also calling from 919-634-6009 peddling their long distance crap.  
They only speak Arabic.  They keep calling even if you tell them to stop.  There is not way to make them stop harassment.

Please pretend to be interested and waste their time as much as possible.  Do NOT give them your credit card number.   This is the only way to get back at them.

Also,

If you are in Canada Please complain here.

https://www.lnnte-dncl.gc.ca/plt-cmp-eng

If you are un the U.S  Complain here
https://www.donotcall.gov/complaint/complaintcheck.aspx

This number call's a couple times a day, every day, when answered
they hang up

got a call, no one talked then they hung up.

It's for a long distance plan. I couldn't make out the name. The girl seemed to want to hang up before I told her no. Very odd.

some number "unknown name" keeps calling me, when i answer they hang up.

(519) 997-3398 "unknown name" keeps calling me, when i answer they hang up.

Hello!         ...............  nobody ???

I missed the call, but when I got home I saw they had called so I called them back but "the call could not be completed as dialed, check the number and call again."  So I don't know what's up with that.

Just got a call from this number labelled as "unknown caller". Didn't answer. I think it's a scam.

It`s probably another scam. Somebody keeps calling me from that number for like around a month now but I never answer. Why would I? World is full of idiots, nothing new under the sun!