what company is this and why are they calling me

Its a BS collection company that has stolen people's information. They call themselves CLN. Its a forwarded exchange number. CLN is an offshore company that operates on the basis of intimidation and wrongful information that was acquired illegally. DO NOT Give any of your information to theses people. Report them to your attorney general for the state you are in as well as the FTC. Ask them for the name and bar number for the attorney they claim works for this agency, they hang up on you. ASk them for the physical address they hang up on you.

SCAM!

Called No Msg. I just put up an ad on CG, could be a response, but I don't answer calls I do not recognize. People should learn to read when ad says TEXT only...

This is a SCAM Collections company. #1 They are off shore and use US Mainland exchange numbers more than likely VOIP to make it look like they are in the USA.
#2 They never leave a message as they don't want any evidence against them.
#3, You may have had your identity stolen or lifted by placing info online for loans and or credit cards, they do not have legit debts against the average person they call.
#4, The US laws do not apply to them as they are not here, and will behave in manners that are upsetting offensive and maybe even scare people into giving up money you really do not owe.

A, Ask for the name and bar number for the attorney they claim they have on staff, they hang up.
B. Ask for the physical address as you would like to discuss this in person, they hang up.
C. This place calls themselves CLN.

NEVER NEVER give anyone any information on yourself over the telephone.