I will advice you to not let anyone to scam you promising you to recover it demading for bitcoin or other money.
+1 to that. If you indeed have a file named multibit-<datestamp>.key in the Multibit-folder, it might be possible to obtain the private keys, but as Oshosondy said: do not hand over anything to others. Instead, let users here guide you through the process (in public, not by PM), or try this tool on your corrupted wallet to see if the script is able to read more data than the Multibit application:
https://github.com/Multibit-Legacy/read-multibit-wallet-file