Unsuscribe premium accounts with mails thats don't exist anymore

I want to unsuscribe 3 zoom premium acccounts that belonged to 3 ex employees from the company i work to and that were paid to run annually. Unfortunatly, the mails of these ex employees, that were related to de zoom accounts, don't exist anymore, so i can't access to the zoom accounts. Does anybody knows how can i unsuscribe these accounts? or where can i write to solve these... I'm from Chile but the way, so there isn't a support phone for my country