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If this is the Golf in your other thread, now 5 years old then even though its done few miles you have done fantastically well to still have diamond cut alloys that don't appear three times older than the car.
There's no doubt its a very attractive finish when new but is the most susceptable to water ingress especially if they see winter salt.
I doubt the dealer has damaged the wheels allowing this worm creep, i have seen the same on brand new unsold cars which have never been registered or even driven on the road (new wheels fitted again when registered and sold), like yours usually starts where the centre caps fit but can worm its way in from the bead too, my winter set with diamond cut edges have gone like this too, i'm getting the beads painted with chrome silver instead of cutting.
MB were one of the first to start this trend, my '96 coupe when new came on diamond cut and lacquered finish, and if you get 3 years without them looking scabby you are doing well, many other makers have followed the fad and they suffer equally if not worse.
The only repair is a full strip recut and relacquer at a pro wheel refurb shop, very expensive and can only be done about twice depending on corrosion depth, if you keep the same usage you will see about the same life again.
Some MB owners have had their wheels shot blasted and stove painted fully with the latest chrome paints, whilst not quite as pretty as the original finish its as close as you can get and is far more robust.
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