Difference – ‘Take Up a Position’ vs ‘Take On a Position’

Both of those verbs are correct and natural in your example, but the verbs "call" and "call in" are not the same.

"Call" means to make a phone call, to or by anyone or anything, for any purpose.

"Call in" means to make a phone call for any purpose other than a social one, usually to report or gather information. For this reason, we almost only "call in" to organizations. Like, if you're sick, you can call in and let your work know you won't be coming in. If a radio show accepts phone calls, you can call in to win a prize. If you've lost your credit card, you can call in and report it.

It's very rare to "call in" with friends or family. Nearly every call to someone you know has a social element to it. The only time you'd "call in" with family or friends is, for instance, if your father is in critical condition in hospital, and you call in with your mother every half hour to get an update.

In context, there is very little difference.

"Broke down" means an engine or mechanical failure, so is common when talking about cars and machines. "Broke" can mean "snap" or "split". You would use "broke" when talking about a bone or a pencil.

If the motor in your fridge has stopped working, you could use either. But if the door has come off its hinges you would not use "broke down".

It is quite possible to say "The fridge is broken", but you would not likely say "The fridge is broken down".