I once got the credit card interest rate scam (by "card services"), and the 3-level guy got so pissed at me for wasting his time he redirected his complaint line to my number. I would pick up to hear swear words and other things. I had to unplug my landline for an hour.
I contacted AT&T, because a lawyer I talked with said that was the right way to deal with this, and I was blown away how little shits they gave and how much BS they tried to get me to do. I canceled that landline soon after.