It's a credit card company based in Las Vegas. Credit One bank.

They SUCK.  They charge OUTRAGEOUS processing fees, interest and late fees.
If you owe them any payment at all, even as little as $10 and it's not paid on time, they call and call and call and call, 3 or 4 times a DAY ... from 2 or 3 different numbers!  
On your caller ID it may say "NCO" or "Credit One" or "800 services".
You literally cannot pay off the balance of the card and cancel it on line, because everytime you make a payment, even if it's to Pay In Full, they tack on another $7 "processing fee".  Pay that processing fee, and they tack on another one... and so on and so on.  So the ONLY way to cancel this card is to CALL THEM DIRECTLY, pay the balance in full and then cancel the card.

They really really suck.  Should be laws against this kind of loan sharking!!

I believe they picked up my number from Craigslist. I just activated the phone, and posted a craiglist ad, and spontaneously got a call form them the same day.

these people calls at least 15x a day wit the 1st call before 8:10 am  these people cant take or listen that ive been in the hospital over a month my right leg is cast from my toes to my thigh so i cant pay them was on time each month but since the accident i gets no exceptions even though ive had the card almost 3 years with paying on time.....now when they call i scream or answer then hang phone up as loud as i can........

Recieved several calls from this number.  No message left either.  Did number search, which indicates it is unassigned...how could that be?

need to know who is calling

I called the # back, it was fast and slurred but believe it said NCO Services. Don't know who that is so hung up!

I call back and they never answer plus I do not have a card I threw it away and was never activated .When I got an answer they say I have to pay fees on something I never used.

does not leave a message just calls and hangs up

they call every few minutes every day.

Yes Good ol' Credit One!  They sent me a card, and I should have known it was too good to be true.  It's a small credit limit ($400) and TWICE I tried to pay off the balance with an online payment, so I can cancel the card... only to find out they tacked on yet ANOTHER $7.00 "processing fee"!!  So you pay the processing fee on line and they charge you another processing fee!!

You need to CALL them if you want to pay in full, and cancel the card!
These guys SUCK.

They sent me a credit card, though to the wrong address.  Never got it, not was it ever activated.  Now, here's the stinky part.....they are billing me!  
I have reported them to the FTC as a consumer complaint.  They are slimy. Calls every 15 minutes or so.

This is another Credit One number