Postal Locations

Went in to the Jefferson Memorial location today and was treated poorly by the man behind the counter. This is not the first time he has given me attitude. All I had on my was $20 cash to pay for my one stamp. He asked if this was the smallest bill I had and unfortunately it was. He then asked if I was in there to get a stamp or if I just came in there to buy a stamp so he would make change for me. I thought this was entirely rude since I legitimately had a letter to mail (he actually place the stamp on my letter). I chuckled and thought nothing of it until later when, at another place of business, I noticed he had shortchanged me by $1. Since I had paid with cash I had already thrown my receipt away and I thought he would have given me more trouble than what the $1 was worth. I felt that since he had mentioned something to me about receiving change, that he shortchanged me on purpose. I know I should have checked the money before I left but hindsight is 20/20. I just know next time to use the Post Office at Tucker and Olive.