Stupid calls, they should not be allowed to call anyone, let alone cell phones, this costed me money and I am at work. It said I won over 2000 Air Miles.
These phone companies will also sell your active number to these telemarketing companies, who will call you. Answering doesn't so much tell them the number is active, they already know that, but at what time of day you are likely to pick up the phone.
As for government accountability... they have much bigger and simpler issues that they have no idea how to solve.