Hi, welcome to the OB.
The flowers having black spots and wilting, and the spike turning red, is not a good indicator that the plant was never watered.
Depending on how low the humidity in your growing area is, a better indicator of whether your plant was watered is how wrinkled the roots are, and how limp the leaves were relative to the time you were away.
Since you don't have photos of the plant nor did you disclose how long you were away, nor where in the US you're in, there's no conclusive evidence that your Phal is in any kind of danger nor in any kind of peril (I'm not saying your worry is not justified nor am I defending your helper, I'm just saying there's not enough info).
Anyways...
Flowers with black spots may mean the blossoms were misted with water and got a mild case of fungal infection on the petals, lip, or sepals.
As far as
misting is concerned - I advise against
misting Phals when using pot culture.
Mounted culture is different.
Misting the leaves in pot culture increases the chances water can dribble into the crown if the plant is grown upright and cause crown rot (Phals don't naturally grow upright in the wild - Phals grow on trees oriented mostly in a horizontal manner or sometimes pendulously in the wild). Over time, when you see your Phal wanting to lean, this is why.
To emulate this growth habit, you can lay a Phal as close to a horizontal position as possible for pot culture, just make sure the leaf tips point down towards the ground. The crown of the plant should face the sun or light source.
Properly growing Phals mounted nearly eliminates the problem of crown rot, because most of the water that gets on the leaves has a chance to dribble away from the crown. Just letting you know that's all.
Back to your topic...
Wilting may mean it was done blooming.
The spike turning red may mean the spike is done (red is a natural pigment within certain cells of your Phal).
If you got this plant in full bloom from older blossom to newer blossom, it may mean this plant may have been in full bloom in the store for quite a while already.
If you got this plant with just the older blossoms in bloom, but with newer blossoms still as buds, it may have had quite a bit of time left before the flowers were done.
Then there's the fact that no one knows how long you've grown the Phal for, and how long it's been in bloom under your care. Did you buy the plant in bloom? Did you bloom the Phal yourself? Do you know how long the flowers last?
My point being - the flowers may have been done blooming depending on what state of flowering it was purchased at.
Another factor is what kind of Phal it is. Is it a hybrid or species? Does it have a name or is it a "No ID" (aka NOID)?
From what you've stated so far, there's simply insufficient evidence to go around accusing the person who helped you for not watering your plants. For all anyone knows, the person may have watered your Phal, ...but not the way you wanted it to be done nor how it should've been done. I don't know...
By the way, if this plant is grown in full sphagnum moss, I recommend you change the potting medium out to medium or large grade bark. If you must provide a little more moisture, just add a thin top layer of fresh New Zealand sphagnum moss.
Or if you live in a very arid place, semi-hydroponics would be a better choice.
Of course, your cultural habits are important bits of information as well. Pretty standard info is humidity, temperature (night, day, seasonal), lighting, where the growing area is, and air circulation.
Photos help too btw.
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Phalaenopsis with red spike after not being watered
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