After, 14 years now, I'm drained listening to another language all the time in the small apartment.
So you expect him to take the whole of the burden of listening to another language the whole time?
I would also have a problem with all the money going to his family and not enough time spent on you as a family, so can't blame you on that score
But as for the language thing you are being totally BU.
You are a couple. Two people of equal importance. That means his language and his background matter as much as yours do. If you couldn't accept that, you should not have married someone from another culture.
How would you react if he told you that he gets tired listening to English all the time, so you just have to stop speaking English? If you have moved to his country, would you have accepted it then?
And you have 3 kids too- does that mean he has not been allowed to share his language and his childhood memories with his own children? I can't imagine living like that, not being able to speak to my own children in my own language.
His spending all that time on the phone to his family may be a cultural thing that wouldn't change anyway. But it may also be because that is the only outlet he has to be himself, because you make it clear that what you want is for him to pretend his real background, the real him that is centred in his language, doesn't exist.
I married somebody English too. But he understood from the start that if he couldn't have given up his language, then I couldn't be expected to do that either. So he learnt to understand it and even to speak it to some extent. If I am on the phone to my family, or speak to our children in my own language, or even say something in my own language because I am tired and shattered and need to be able to use my own language- that's not a problem.