Your WOW account lost last night and then what should you do

Firstly, Contact Blizzard Support. They should be able to restore the account for you if you have the account information. You can be honest about the deletion and tell them someone else deleted it on you without your permission.
Secondly, if you have no time, you can buy from a website such as w w w. ugamegold. c o m which is a safer site.