I called the phone company to disconnect my landline ...
OK, I'll wait while you get it out of your system. "Gee, did you have a rotary dial? A candlestick phone? Do you have a Morse lamp? A telegraph? Gosh, you're old!"
Done? Good. No, the reason I ...
"Did you have a sundial, as well? Do you get your water from a bucket and a well?"
Shut up. I get it. The reason I had a landline was sheer laziness. A year ago I switched to VoIP (Voice Over Internet, Poorly, or something like that) but kept the phone in case there was a very specific tornado that took out the cellphone towers.
The only people who called were telemarketers and fundraisers. So I called to disconnect, and the nice operator gave me a rate of a dime a day for three months to see if I really might want to change my mind. So I agreed.
But then I heard from no one but telemarketers and fundraisers. So I finally called to disconnect, and let me tell you: I would rather step on a bear trap and saw off my leg than go through that again, because at least when you saw off your leg, you're in charge.
What you want: "Hi, I'd like to disconnect my phone."