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Your partner needs to speak to his ex. It's not unreasonable to take the xbox away when he was swearing, you have done the right thing. But I wouldn't even engage with her if she was going mental. I'd just say "I can't talk to you about this while you are going mental, I'll get x (your partner) to call you to discuss it later" and hang up.
Ignore the ex. Your partner backed up your decision to take it away. That is all that matters.
Your definitely in the right! If she is unhappy she should call and talk like a reasonable adult. This step parent gig is so hard some days xx
I never date a man with a shitty kids