It's not Kemper that s*cks, it's Brexit that s*cks. Whether you have voted for it or not, your have to live with the consequences.
I completely disagree, that Kemper doesn't care about their customers. I had mine unit serviced twice, all done swiftly.
You can always try competition products and their service. By the time they will accept your request, new version of the device (FX7 Ultra Crypto HEX) will be released.
There are always solutions though. You can move to the country within EU
I feel your pain, I wish you luck in your endeavours, but the biggest factor on what happens was decision to leave the EU.