Convergentusa

Got a call from an Oxnard area code number and other spoofed numbers with the same prefix but with 6664, 6766, 6715 as the end numbers. IPhone ID them as Convergent Outs; which turned out according to Google to be Convergent Outsourcing, a debt solution company I never contacted them about. Why would a company have 4 different phone numbers? Sounds like a scam to me. Doesn't a company have one phone number with several extensions. Why a local phone number and not an 800 number? I don't have a good vibe about them since I did not contact them nor do I recognize them as reputable company. Sounds creepy.