Blackmailing.

"Am I not allowed to contact you?" the voice from the other end asked Nicklaus, "Whereas, we're business partners and soon, we will become families," 

Nicklaus's mind turned numb for a moment and when his brain resumed functioning again, he clenched his fist by his side and tried to control the anger running through his veins. 

"What do you mean by families, Mr. Robert?" he questioned with a stern voice, trying his hardest to be polite which was nearly impossible as his anger was about to get the best out of him.