deleted because they could not apply payment on time
Whether that statement is true or not, unfortunately, we cannot fix customer support issues. Generally, the only "fixes" are: 1) to file a grievance with the government authorities in charge of consumer protect; 2) attempt to bring your plight to the attention of upper management (sometimes they don't know things are bad); 3) sue the bass-terds; 4) spread the words but have your rock solid proof that "it was ALL them, not you" ready.
You might have to buy back your domain "at auction" if you cannot grab it on the drop.
I'd keep a close eye on what is done with the domain, if you lose it, to see if someone (who you can sue) infringes on your intellectual property rights.
Lastly, if someone acquires it "just to park it, for residucal traffic revenue", you can make their investment (if they buy at auction) worthless by convincing any/all who linked to the site to pull down their links (because it's no longer a functioning site).
Sorry about your plight. It's a painful lesson. If a site IS someone's "big ticket" (to riches) it's always wise to register the domain for 10 years, choose the best reputed registrar, harden your login and protect your login details.