So what did Vlad do that is wrong? Matt indicated he had cut including ownership of BitTalk. Guess that was yet another lie made by Matt. If Vlad uses his defaulted obligations as leverage to boost him from the company before he does anymore damage I don't see a problem with it.
Honestly I am not sure what the problem is? Matt hasn't repaid the debt because he feels nobody is in a posistion to collect. Vlad believes he is in a posistion to collect. Selling debt to "stronger hands" happens all the time, everyday, all around the world. Vlad likely wants Matt far far away from the company he is a part owner. Can you honestly blame him? Matt has already done significant damage and if it comes out later that Matt still owns a significant stake that will be another blow to the company. Obviously depsite his "apology" Matt is looking to play hardball and Vlad see his debt as a method to gain leverage. It is called "big boy business".
Also Goat posting PM publicly?

They are called PRIVATE Messages for a reason. Nobody is saying it is criminal but it is downright scummy. Your actions indicate you don't care if a conversation is private you are just going to violate that privacy when you feel like it.
Kinda sends a message that nobody should ever do business with you and nobody should ever tell you anything in confidence.TL/DR: "snitches get stitches" j/k
This misses a very critical legal point. Does BitTalk and Vlad have right of offset on Matt's debt? If I were in Vlad's position I would be getting legal advice pronto. Seriously. Otherwise Matt could potentially bankrupt BitTalk over this.