I didn't pick up his calls , and now he is threatening me that I'm sorry but it will cost you , what will I respond
"Hey, sorry I missed your calls - I was busy. What's up?"
"I'm sorry I missed your calls. Threatening me isn't a great way to get my attention. If you want to talk, speak to me respectfully."
"Apologies for missing your calls - I was unavailable. I'm free now if you'd like to discuss whatever is on your mind."
"I didn't answer because I was busy, not to ignore you. But threatening me isn't okay. If you have something important to say, say it calmly."
"I'm sorry I missed your calls. I'm available now - what did you want to talk about?"
No I'm talking about a narcissist case that we discuss yesterday,