when i answer the line disconnects

They are selling something to do with septic systems.

They called three times yesterday, no messages left.  I answered it today,
it is a machine.  It's all about a septic system.

4 calls in 3 hrs. Someone needs to prosecute these idiots for harassment

calls to pitch an offer about septic systems because their records indicate that i have spent alot of money on it in the recent past.  when i ask how they got my information, or who (by name) they are calling, they hang up.  they have called me roughly once a day for the past two weeks, i was only available to answer twice. Both times they end up hanging up when i ask for any information from them.