That is a really good system you have over there.
I suspect the company would just respond “the dishwasher is working fine the owner just refuses to enable features as per the manual”.
Take them to court then! Get a group action or just small claims it. Do a CC charge back. They really can't deliver garbage.
In 10 years that appliance may not connect to your wifi if the scheme has changed e.g. 2.4Ghz is dropped or something.