I believe that is a cross EU thing, since the UK got it while still a member. i.e. the reversed burden of proof during the first 6 months, where it is assumed

I believe that is a cross EU thing, since the UK got it while still a member. i.e. the reversed burden of proof during the first 6 months, where it is assumed the device is at fault, and they supplier has to prove it is not. So in this case I'd agree, I see little proof just an assertion, and would suggest they institute the process for their equivalent of a Small Claims Court case.