Urgent Help Needed for Hacked Wordpress

My Wordpress website has been hacked and I need an expert to help me resolve this issue immediately. The site is facing several changes and issues as a result of the hack, and I need someone who can efficiently and effectively address them.
some files are injected, some wordpress file changed premission access automaticcly, even after i put right permission, it s changed again immediatly
need to clean and secure the website