anyone?

Hello there this is my first post! I have been trying to remove 2 defaults from my file with not much luck until today maybe. I requested a copy of my original default notice from natwest loans which is at telford- they replied today saying under the credit act blah blah it is not a requirment blah blah and in the letter they sent it to my address where i was living at the time and they stated the address on this letter but with the wrong post code! maybe i could argue the fact that it never got to me because the address was wrong therfore its there muck up, what do you guys think?