Now, Let's hold it up for a minute or two. As it was already mentioned here in AD that many companies tends to think the relay services are telemarketers or coming up with some kind of advertisements. It is understandable that they would have thought you were one of the telemarketers or something like that.
Perhaps, You should have explained yourself a bit clearly and instruct the relay operator that you're calling to inquire about some informations that Target has. Most of the time when you instruct an operator for the relay, they will go by what you instruct them to do. If you didn't, then it'd be natural for Target to think that it was a phone call coming from a telemarketer or else.
I'm saying, Nobody is at fault here. There are still a lot of people out there that are still not aware of how the relay services works. I know, I get myself annoyed when I get hung up while using a relay service but not for a minute, it did not cross my mind that it was the operator's fault or the person on the other end's fault. It just means that we still have to educate them one way or other.
Just my 2 cents.