Got a call from this number but didn't answer.

Calls and calls and calls. Says "Call Center--MI" on caller ID. I don't pick up.  Then, another number, from another "Call Center" in Florida calls. This is a business number and I hate to put it on the "Do Not Call" list, but it looks like I have no choice.

I don't pick up the phone anymore for Telemarketers.If anybody would like to send me some information about the name of the company or the caller type,it would be great.