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Ok makes sense, I'll give it a try...I read somewhere I need to set the zappi to eco+ mode instead of 'fast' when it's the integration with IGoIt sounds like you have set octopus up to integrate with the car and not the charger.
I would remove the car from the ocotpus app and re-set intelligent go up to work with the Zappi charger and this will stop happening. Leave the charger in octopus mode and it will only start charging when octopus tells it to.