Hundreds of Pokémon Go fans have been left devastated after an update reset their games, wiping out three weeks worth of Pokémon catching.

Fans of the game took to social media in disbelief after realising that downloading an update for the game had led to the application resetting itself.

Some have called for any money spent on Pokémon Go to be refunded while others desperately searched for a way to reverse the change.

Gustavo Flores complained he was on level 20 when his account was reset.