Got same call answered but nobody ever said anything after 2 minutes I hung up phone

Company calls several times a day and no messages.

Shut down any answering device and ignore all unknown numbers. As long as they get an answer of some sort, they're likely to keep bothering you. They'll tire eventually of calling numbers that offer no answer. A call blocker may be of some use to you, try blocking their call as well.

Collection agency

CONVERGYS
Posted in:  http://800notes.com/Phone.aspx/1-980-335-5178
Web site lists several locations, main branch in Ohio:  http://www.convergys.com/company/locations/index.php
But they claim to be an outsourcing company, so considering where their branches are, it might answer the age old question, “Where did they get our information?”
BBB gives them an A+ with 2 complaints but does not list them as a collection agency:  http://www.bbb.org/cincinnati/business-review ... ati-oh-26001047
Their LinkedIn page mentions everything but collections:  https://www.linkedin.com/company/convergys
Ohio Dept. of State has numerous names for these people, but here is the general info:
Entity Number    947163
Business Name    CONVERGYS CORPORATION
Filing Type    CORPORATION FOR PROFIT
Status    Active
Original Filing Date    07/02/1996
Expiry Date
Location: CINCINNATI    County: HAMILTON    State: OHIO

Agent / Registrant Information
C T CORPORATION SYSTEM
1300 EAST 9TH ST
CLEVELAND,OH 44114
Effective Date: 02/12/2009
Contact Status: Active
Incorporator Information
DOROTHY S KIM
Filings
Filing Type    Date of Filing    Document Number/Image
DOMESTIC ARTICLES/FOR PROFIT    07/02/1996    5559_1261

DOMESTIC/AMENDED RESTATED ARTICLES    05/15/1998    199813500626

DOMESTIC AGENT SUBSEQUENT APPOINTMENT    05/15/1998    199813500625

DOMESTIC/AMENDMENT TO ARTICLES    12/16/1998    199835100064

DOMESTIC AGENT SUBSEQUENT APPOINTMENT    03/23/2001    200108901370

DOMESTIC AGENT SUBSEQUENT APPOINTMENT    10/02/2003    200327602888

DOMESTIC AGENT ADDRESS CHANGE    08/11/2004    200422500934

DOMESTIC AGENT ADDRESS CHANGE    12/06/2004    200501301310

DOMESTIC AGENT SUBSEQUENT APPOINTMENT    02/12/2009    200904401934

DOMESTIC/AMENDMENT TO ARTICLES    05/25/2010    201014500319

MERGER/DOMESTIC    12/08/2011    201134301424

Old Names
Effective Date    Old Name
05/15/1998    FIRST INTERWORLD CORPORATION

Federal law (FDCPA) requires them to send you a letter (US MAIL ONLY) within 5 days of their first contact that contains their name, physical address, the creditor’s name, and the amount of the alleged debt.  It also must contains “mini-Miranda” telling you that it is an attempt to collect a debt and that all information will be used for those purposes.  The one other important thing that this letter must also have in it is that you have a right to dispute the debt within 30 days of receipt of the letter and if you do so, all collection activity must be stopped until the debt is verified.
Read up on your rights here, get template letters to send and also make a complaint at this government site:  http://www.consumerfinance.gov/
Also file a complaint with your State Attorney General's office.
List of State AG’s offices:  http://consumerfraudreporting.org/stateattorneygenerallist.php