Remove your personal details and post the bill.
It is very unlikely the meter is faulty, and a reading error happens once, not twice. You may not even have a person reading the meter, it's likely wireless, in which case there is no error.
Let's look at the logical probabilities before we go crazy speculating. People that 'steal' power and build grow ops steal the power before the meter, not after. Using huge amounts of power for illicit purposes when someone else is paying the bill is unlikely.
A clamp on ammeter is cheap and safe. You might need one to dig into this. You don't need anything expensive.
https://www.amazon.com/Auto-ranging-Digital-Clamp-Meter/dp/B001VGND88