Unless your dealer provided you with written evidence from the brand that they outright refuse to allow them to carry out the update package then I'm going to say your dealer is telling you porkie pies there mate.Hi you must be one of the lucky ones Cupra refused to allow my dealer to carryout a full upgrade and denied there was a recall available.
There is a recall (90Z1) BUT - it would only appear to cover PHEV models at the moment.