Complain about Plagrism Check | NO mail From Codechef | RIP Plag

@admin @codechef Please help me!. I Have been given a penalty of -423 for plag but. I haven’t received any mail from CodeChef about this.
also, I haven’t shared or copied code from anyone! how, could my code match anyone! please look into and reverify.

Please, sir, do whatever is needed and help me!