This happened to me not too long ago with a great PIN offer for my October dates (large % off of room).
The pin e-mailed for me was for someone in a completely different state!!
While the CM was very nice (and after checking with manager), she did state that I was unable to use it due to the address not matching and people abusing pin code offers that were not for them in the past.
I told her (very nicely) that I realized it wasn't her fault and would like to speak to a supervisor to express my extreme disappointment with their marketing department (or something like that).
A few minutes later she came back on with a manager's approval (the second manager she had spoken with) to use the PIN.
I was able to book the 3 rooms I thought I was going to need.
Of course, a couple of weeks later the rest of the party decided to stay offsite

so we didn't even need the rooms.
At no time was I upset, loud, or rude with the CM as I knew that she had absolutely nothing to do with me being sent a PIN that didn't match my address.
I don't know what on earth has happened to cause such an extreme mix-up of e-mail addresses though!!