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Because they piss us off with their annoying calls :D

You're not annoying :D
What are we here for if not for helping and sharing experience? :roll:

Yes, right, "ego" sounded as "evo". That's correct. "Ego" is spoken "evo", "Kogo" is spoken "kovo",...

Here it is

"Dobry Den', Kristjan doma? (da) Pozovite ego k telefonu"

Is it slow enough now?

Not at all. Privet can be addressed to a person you're familiar with enough to name him your buddy/friend. You should use "Dobry den'" (is the easiest to pronounce), Kristjan doma?

They will...

It's unpolite.

At least: Здравствуйте/добрый день, <boyfriend's name> дома? -- да --, позовите его, пожалуйста".

That will work.

You can say:
Zdravstvuyte, mogu ya pogovorit' s Kristjanom, pojaluysta?
Здравствуйте, могу я поговорить с Кристьяном, пожалуйста?

Here's an audio record so you can hear how to pronounce it...