If you could add a further description of what happened to your driver it would help. Is it that the surround was damaged? If so can you just have it reconed?
But WHATEVER is wrong with it, the premier speaker repair service in my opinion is Millersound, it's all they do. They are very specific about the brands they service. Pioneer is one they service, Tad is not. Calling Bill there and seeing if they will repair your speaker is without question what I would do.
TAD was no help.
The person you talked to was no help. There are so many like him/her. If Millersound won't repair your speaker I wouldn't give up on Tad, but instead move up the managment chain until you find a person willing to help.