Pro tip, tell them you want to end your subscription immediately. Don't say anything, awkward silence.
When they ask an another question to goud you into staying repeat the first statement. If they ask rando questions, silence.
They give up in under a minute. Be polite but obstinate.
Use a service like privacy.com. Cancel the card they charge monthly... no phone call needed.
Added benefit is if the vendor is compromised there is no loss...the cards can be locked to only allow charges from 1 business. Steal the credit card info... can't use it anywhere else.