Dollar General review: Customer Service/Self checkout

I went in with a broken foot to exchange my empty propane tank. Upon checking out I was told that empty propane tanks are not allowed in the store. Thats fine I didnt know, I then asked if i could purchase the propane exchange while i was in the self checkout lane. The Lady then said no i would have to go to the regular isle. No problem. The problem arose when the rude lady on duty refused to ring up the bottle of wine i brought to self checkout. Now i know she was lying because i have purchased alcohol there before. She was plenty old enough at least mid 50s maybe 45. I put the wine back and ill never go there again!