Great Geyser, No response on aftersales service!

I bought a house that has this geyser installed before I moved in, but, no matter how much I tried, the company cannot assist me with a user manual. The geyser is smart and locked, so I cannot make any adjustments and power4less just ignores me saying they have no record of my geyser, how should that be "my" problem?. I was going to get others to purchase this technology, but now I think everyone should steer clear, there is absolutely no aftersales service on such an expensive item.