the wallet files are saved in your PC's disk, usually in: electrum.readthedocs.io/en/latest/faq.html#where-is-my-wallet-file-located
That said, there's no way for others to set a password in your wallet remotely unless your PC itself can be controlled remotely/physically.
Most of the time, it's a user who got confused, failed to remember what really happened, not telling the whole truth.
Please provide as much info as described in this sticky topic: [READ BEFORE POSTING] Tech Support Help Request Format
For now, try to look for other possible wallet files.
There's a chance that your old Electrum wallet is a "Portable Version" which uses a different data directory which saves the wallet files in its own wallets dir.
It's usually the "wallets" folder inside "electrum_data" folder inside the same directory where electrum-portable executable is located.