OK. You need to pause a moment and think.
You worked on your site and for some reason you hired someone on Fiverr to do something on your design webpage and he deleted it without explanation what so ever?
You do not have a backup screenshot or you did not save the HTML copy of the site in any way shape or form?
So, let us presume your site is lost and you lost your time.
Next is Fiverr. Once CS reaches your report they will issue you your money back. It will take time, but it will happen. So you are safe on that.
But still, we do not know what you hired Fiverr sellers to do, what they did or did not do, and what has happened to you exactly.
Yes and no. They accept users without screening and as result they get 90% users who do not read TOS or have even capacity to read and understand TOS and when they face issue, even slightest - they go to CS.
Even here on the forum, you have the same situation. It is clearly stated to read the forum before posting and you have 50 new users every day 5 new topics by them, 3 minutes of reading time.
Fiverr is not failing, humanity is failing. From day one to the last day. But that is another issue.