Did you already ask Fiverr why they did it? In case you didn´t yet, it might be a good idea to do it, I´d recommend less ??? and !!!, though.
Talking to them in a sensible way might either lead to your gig being reinstated (it happened for some sellers) if it was a mistake on their side and not from yours, or at least you´ll know what the problem was, so you won´t repeat it. We can guess and commiserate, but we can´t with certainty tell you why Fiverr did what they did, only Fiverr/Customer Support can.
Sorry to hear this and good luck!