Comment Some answers to the know-it-all comments: (Score 4, Informative) 246
MS didn't sue earlier because it's really hard to find a legal entity to sue. When you get one of these calls, the thing calling you is not directly attached to a land line. It's a software pbx system that may be running on a compromised machine in some part of the world. The call only gets connected to the person you talk to after you connect and the system determines you may be a real person willing to talk to someone. The calls get routed through compromised voip service providers, compromised pbx systems, or termination lines leased with false id and credit cards. By the time the provider knows what's happening, tens of thousands of calls have been made and the front end system just moves to another provider. As to "opting out" -- only legitimate telemarketing organizations bother with do not call lists. These asshats just random dial. It's cheaper.
To figure out who to sue, you have to participate in the scam long enough to have an actual transaction processed and then follow the money -- but that's not so simple now. Most of these particular kinds of scams don't accept payment at the telecenter you're talking to. They just install the ransomware on the pc. Then once you're already compromised you have to pay someone else -- through a web site, a wire payment, or some other mechanism that's much easier to hide than just a credit card transaction.
To figure out who to sue, you have to participate in the scam long enough to have an actual transaction processed and then follow the money -- but that's not so simple now. Most of these particular kinds of scams don't accept payment at the telecenter you're talking to. They just install the ransomware on the pc. Then once you're already compromised you have to pay someone else -- through a web site, a wire payment, or some other mechanism that's much easier to hide than just a credit card transaction.