I heard about a plum job a few weeks ago which I was perfectly qualified to do. I emailed to find out more and was told to send a CV and covering letter in the post. I duly printed off my CV and wrote a covering letter and toddled off to the Post Office to check the postage and buy a stamp. The lady behind the counter told me that my letter was fine to have just a first class stamp on and she put in straight into the sack ready to be sent after she put the stamp on. This was a week before the deadline for applying so should have got there in plenty of time.
I was a bit annoyed that I didn't get any sort of reply from this application as I thought that I would at least get an interview.
I got an email yesterday from the same lady who had told me how to apply to say that my application had only just got to her because it didn't have enough stamps on it. 
AIBU to be totally pissed off with Royal Mail/Post Office? Surely if the woman behind the counter tells you that what you are posting is a letter they can't suddenly decide that its actually a large letter and want to charge more?
Grrr.