Hello MadonaMady,Are your files and folder / directories permissions set properly? They should be 644 and 755 accordingly except for the cache and tmp folders.
First of all , change all your passwords , strong passwords recommended.Then , check the apache log files of the serverThen check your computer for virusesDo you have the latest version of elxis installed?Finally , is this the only site with problems? Are there any other of your sites hacked?
All your sites are elxis powered?
check your server log files, to see how they get access to your files
and one static website without any php programing on it just html files