This one's a goner. The rot has progressed all the way into the crown from the pics you've posted. I think the thing to do is to pitch this one, sterilize everything that you have used for it with alcohol or by soaking it in bleach water, and then go get yourself another one.
When I lost mine, I went out looking for another orchid just like it, and I ended up finding one that I liked a lot better. It's sitting beside my laptop as I type and it makes me smile to see that this one is thriving.
There are some things you should watch for when buying an orchid. For the larger phals in 4 inch pots or bigger, I want them to be planted in bark, but moss isn't a deal breaker if the moss isn't soggy. I can always repot later. I look for signs of recent growth on the roots, or in the leaves. If I see a lot of cut spikes, I pass on the plant because that tells me that the plant will likely not flower again next year and that it's probably been sitting around for a while. Also, if the plant isn't potted in a clear plastic pot, inside a decorative pot, so that I can look at the roots inside and check for brown, mushy looking roots, I pass on the plant. You just never know what's going on inside the pot and having that clear pot to look through, gives you a good indicator of what problems the orchid may have.
Hope this helps!
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