How to solve this error?

On my PC there was a failure in the system, and I had to carry it for repair. It was successfully repaired. But now I have to return the old data - as a result of physical damage to the media, some files were damaged - mostly text format microsoft word. In documents, arbitrary parts of files are replaced by meaningless symbols in places where a different style or format is used. I'm tired of racking my brains and finally writing about my problem. What are the options for action?