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I am sorry you are dealing with this situation. Your Realtor may be correct that the warranty doesn't cover the damage. You should check with the warranty company themselves however as I would not take a Realtor's answer as being final.
Regardless, assuming the Realtor is correct, that does not mean that the owners who cleaned the carpets can not be held liable for negligence that resulted in damages to your property. If the cleaning of the carpet was not done with a reasonable standard of care, then damage caused from this breach of reasonable or standard repair would subject the owners to liability.
Unfortunately, this is likely going to require a lawsuit against the owners to bring this matter to a resolution unless you can get the owners to admit fault and agree to pay the costs of repair. But if they do not you will need to determine how much the damage is (that is to repair and replace the carpets) and sue for that amount.
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