As with most motorcycle manufacturers, and to a lesser extent cars makers for that matter, the relationship you (as the customer) have with the supplying dealer, and the dealer has with the importer, is vitally important imho. These relationships can be the difference between getting a genuine warranty claim resolved in a timely manner and it dragging on for months.
Warranty claims in the UK (and I would guess in other countries too) can be difficult, as legally a buyers contract is with the supplying dealer, but the dealer is beholden to the importer to get claims approved, so they’re piggy in the middle really.
As in most of life, there’s good and bad dealers and importers - I’d love to know the real reasons RE took the importation, distribution and warranty side of the business away from MGB recently. This new arrangement will take time to settle down, and in the meantime people with issues like the OP has with his bike are sort of stuck.
This would not stop me buying an RE product, which imho is a bit of a knee jerk reaction because of one warranty case with one dealer - in general the bikes have proved pretty reliable, however despite saying all of the above, I’ve recently heard that the dealer closest to me (CMW Motorcycles in Chichester) are closing down shortly, which is a shame as they’re good guys and have been Aprilia and RE dealers for years. Things change I guess.
I hope the OP gets a satisfactory resolution to his problems soon.