We were getting weekly calls from the Microsoft scammers, we couldn't get rid of them.
We had a call from India, saying our Internet was going to be cut off in 2 hours. I had fun with that call telling them I was happy about that as I'd been trying to get it disconnected for ages. They were so confused and still trying to convince me that I had a problem. They haven't called back since.
Then there were some calls from India wanting to speak to the person in our household who had had a car accident within the last two years. We kept saying that no one has and continued to get weekly calls. A few weeks ago I played along but since he claimed he was calling from my local area, I asked for his name and address and said I would visit him personally to file the claim. It was a bogus address of course but they still had the gall to call me the next week. So I thanked him very much for urging me to make an insurance claim and I had now done so. He apologised for calling and I haven't had another call.