The growth with black at the base is dead. On my desktop monitor I can see the pseudobulb is also black. This is unusual for Cymbidiums unless they get very much too hot, or very much too cold. It happened before you bought the plant.
Despite the season I would remove it from the pot. I would use a sanitized garden shears to cut off the black growth at the base. I would sanitize between cuts with 10% household bleach in water.
I would try to cut off at least 3-4 connected pseudobulbs in good health, and repot them into fresh medium. Care for them as has been mentioned above.
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