Steal my account

Somone steal my account, data,password etc.. after he change my email with help of ovh support. I dont know who .. but now i dont have acces to my account and my business is in dangerous.
i try to contact the ovh on the phone and they put me to send email .. i send yesterday,i send a new one today .. and nothing ..

My luck is that that i have the 2 factor auth active and the thief can`t login in my account . I receive message on my phone with key ..

WHAT I NEED TO DO ? I'm desperate