I am not so sure that this is part of your plumbing warranty.
Without knowing about your specific case, it is normal for the Plumbing Subtrade to supply the undermount sink to the subtrade that makes the counter top.
If this is going back to a subtrade's warranty, I don't think it should be the Plumbing Company, it should be whoever installed the sink. Usually the Granite/countertop people.
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