I got a call from this number earlier today. Just like so many before, no message was left. When I tried to call the number back, all I heard was "for quality purposes, this call will be recorded. please wait for the next available agent.". After that, a hangup.
I also got a call from this number. I borrowed an unregistered prepaid mobile phone and dialed this number. The message said what you quoted in your posting. I hung on and an agent came on and said "NCO - Felicia Speaking". Upon further research, I discovered a company called NCO Financial. The best available research indicates they are a very unscrupulous collection agency that frequently operates outside the policies of the Fair Debt Collection Practices Act.
I got a call from this number earlier today. Based on previous postings, I have determined that this number belongs to NCO and offer the following piece of advice to them. When you call someone, if you want them to get in touch with you, you really should leave a message which states the business nature of your call, including account number(s) and any other pertinent information. I will NEVER return a call to a number that I don't know and doesn't leave a legitimate message.