HMRC, Is the "H" for horrible?

Had to phone HMRC today from work because someone, another Local Office had received mis-directed mail and sent it to us.

So being nice phoned for the address and was met with what could only be described as a barrage of hostility and rudeness.

"Hi my names Marri and I'm calling from [insert work place]"
"Yes?"
"Well I have an item of mail here, its an Inland Revenue form and its been misdirected to us by mistake, so I'm phoning for the address to send it back to please, I can't see it on the form and I can't see it in the Yellow Pages"
"You've opened the mail?"
"Well, not me, our mail opening and they have sent it to us, its just been mis-directed"
"You've no right to open that mail, its not addressed to you"
"Excuse me? I've explained it was misdirected to our office and I'm trying to send it back to you, there is no returning address, I didn't open it and I would appreciate the address to re-direct it properly."
"Theres no address on the form?"
"As I've explained twice, no, because if you had perhaps put the address on the form the customer might have been able to send it to the correct office and I wouldn't be phoning you looking for an address to send you back information you have presumably asked for."

Silence

Address is then given and call is ended. Seriously get a fucking grip. You try to do someone a favour