The telcos are part of the problem. I work for a company that deals with incoming robocalls -- thousands a day. I have a very long email conversation in my inbox between us (company) and Verizon. The general theme in this conversation thread is
COMPANY: we're getting thousands of these robocalls into our various numbers, will you please help to stop it?
VERIZON: We don't see a problem, everything is fine. Your bill will be there soon.
COMPANY: attached is a log showing 4,000 calls in the last two hours sent through your network and terminating at our location. Will you please help to stop it?
VERIZON: we have investigated the provided calls and we see nothing showing these calls originated from us. Please contact the upstream telco and ask them. Your bill should have arrived by now, pay it.
COMPANY: but Verizon does not provide us with information on the upstream telcos, we need your assistance in stopping the robocallers. This bill is considerably larger than usual because of all these robocalls. Will you please help up stop them?
VERIZON: we recommend your legal team contact our legal team if you feel we are actually allowing robocalls to pass through our network to yours. Pay your bill immediately.
COMPANY: we're getting thousands of these robocalls into our various numbers, will you please help to stop it?
VERIZON: We don't see a problem, everything is fine. Your bill will be there soon.
COMPANY: attached is a log showing 4,000 calls in the last two hours sent through your network and terminating at our location. Will you please help to stop it?
VERIZON: we have investigated the provided calls and we see nothing showing these calls originated from us. Please contact the upstream telco and ask them. Your bill should have arrived by now, pay it.
COMPANY: but Verizon does not provide us with information on the upstream telcos, we need your assistance in stopping the robocallers. This bill is considerably larger than usual because of all these robocalls. Will you please help up stop them?
VERIZON: we recommend your legal team contact our legal team if you feel we are actually allowing robocalls to pass through our network to yours. Pay your bill immediately.