Don’t be a HOLY COW in this 21st century! Is my take. Please scold them left and right in local language, is what I am doing occasionally and whenever the call being made. This also kills my own time. So now what I do is receive the call and keep the phone in a place. Do not listen and hence no argument. Just tell them keep telling your proposal and how you sell your product in Jobissh. Then keep your phone apart till the call goes for auto disconnect.
Anyway let them spend their talk times .