I think from that one sentence, it can be interpreted in different ways, and it might not be meant as an insult. If that's the only verbal insult that you think SGC has made, I think you should give them the benefit of the doubt, and that no insult was meant.
Interpretation 1 (which I think you are seeing):
(1) "Based on my research your concern is valid."
This could mean that SGC is saying that your dad has no integrity, which I believe is the interpretation that you are taking.
(2) This same sentence could also mean that SGC understand that your dad is concerned about his loss of integrity among other collectors, and they understand why he is concerned BUT they themselves don't question his integrity.
I think this second one what SGC probably meant, and they should be given the benefit of the doubt. Just from my personal experience, SGC has always provided superlative customer service for me although I have never been in this type of situation.
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