[drc]

I assume the vouchers were to have cards graded not autographs authenticated. If so it would have been nice if they accepted them for an autograph authentication, but up to them. Perhaps they they never give out free autograph authentication vouchers or coupons or deals ever (I don't know), so vouchers of any kind are never accepted for autographs.

I do understand your point about customer service, but I also know if you take a grocery store coupon for grapes they probably won't let you apply it to bananas. That's less about the grocery store's customer service, than that the coupons are for grapes not bananas.