“Oh, hey Debbie. Sorry, I meant to call someone else.”
You wanted to call your friend, but instead you call your landlord's phone number by mistake. You know your landlord pretty well. When she answers the phone, you say this.
Oh, hey Debbie. Sorry, I meant to call someone else.
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Hey (name)
You say "hey" to people who you know when you first see or speak to them:
Hey Boris.
"Hey" is the same as "Hello" but more casual.
Sorry.
"Sorry" is a way to apologize for a small mistake you made. When you make a larger mistake and want to apologize more strongly, you can say "I'm sorry for ___ing":
I'm sorry for calling you by mistake.
However, in most situations this would be much too strong of an apology. So just saying "Sorry" is sometimes more appropriate:
Sorry I didn't call you back sooner.
(someone) meant to (do something)
When you did one action, but you wanted to do something else, you say that you "meant to" do the 2nd action:
Sorry, I meant to call you earlier but my phone died.
"Meant to" means that you planned to do something but didn't succeed.
someone else
This means "another person" but "someone else" is a more common way to express this idea.