Ask UK

I never yell at these people but I will often hang up on them after the first “sorry not interest” gets ignored.

Nah. Here's the rules:

1. don't yell so they have an excuse to hang up
2. ask them to repeat things, and parts of things, and more things, as some sweatshops have rules that say the customer must understand the pitch before they can be hooked legally.
3. never say yes
4. never hang up; let them
5. question everything
6. remember not to give out ANY personal information - not even confirming they have the number they think they dialed - until they can concretely prove whom they are. (This is a bailout for legit organizations that call you and accidentally sound like scam calls. They should immediately ask you to look up their 800 number and call a given extension within that publicly-advertised phone tree to somewhat confirm their identity)
7. now the game is on. Your goal is to rack up the minutes they spend on you. With enough players, it finally becomes a losing proposition to run a phone sales/scam organization; but it's gotta be a lot of people.

My record is 75 minutes with a 'Bell Atlantic' rep who was fluid with details and gave me an edge to contrast the data-points, and who finally hung up claiming she wanted to validate my information, Mr Thomas, to which I replied "Thomas, who the hell is that?" before the line went dead. I loved rocking out phrases like "well are you lying now or were you lying then?" I sometimes hope she took a different job the next day and hope she's seen success. My name isn't Thomas.