You would at least reduce your import and pay less to PEA by wiring the charger for 3-phase and hopefully it will also correct the metering discrepancy. I still don't get how a big player like Huawei can do that kind of mistake which if true ought to be a software bug.
Ask the guys from the PV installer to also confirm that you have 3 external current transformers (CT) which measures current flow to/from the grid and that all consumers are installed behind the CT's so that there is no consumption hidden from them.
Your graphs of the 3 phases says that you have them but make the installer confirm it.
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