For places that require a phone call I came up with a trick to cancel via email. If they reply back via email and say I have to call them, I tell them I'm deaf and can't talk on the phone. Works every time.
I actually have a speech impairment (a stutter) and you’d think people would be willing to accommodate. I can speak just fine when I have complete agency over the words I choose to say, but it’s the absolute worst when I have to read out some long specific access code or account number and say it 100% correct. Stutter even once and they think I meant 2 P’s when I just wanted to say a single P. And then it becomes this long drawn out process of “after AF6, it’s just a single P, but the rest of it is right” because I really don’t want to have to read out the entire code again.
But sadly there have been more times than I can count where I told them I have a speech impairment, it’s difficult for me to say certain things in the way they need me to right now, and I’d prefer to send them an email (even offer to send them an email for them to open while we are still talking)... And they said no they cannot do that for one reason or another.