How to unblock my site on Facebook !!!

Hi
My site was blocked from Facebook, a year ago I was posting on Facebook groups and it was blocked.
I wrote to them and they told me that it is not blocked.
I tried running an ad campaign but it is being rejected
What is the solution to unblock the domain?

Look at fiverr, there is a ton of fellas who offer facebook domain unblock service

Better buy a new domain.