Tried to port my number from att , rep added a new line instead...

I went into a att store to have my number ported over from a different carrier and also upgrade my line for the bo go offer. I went instore because I was unsure of the process of porting over a number. The in store rep told me that I needed to purchase a new phone first and then I would be able to port my number over to this new phone. The att representative then informed me that since I was adding a new line I would qualify for the bo go offer and helped me complete the order online to do so. The representative messed up my order and instead of porting my number , she added a new line. Now I am being charged extra for a new line that I don't want and didn't wish to receive. The new purchased device never came because it was lost in transit and now I cant upgrade my device or port my number for the bogo offer. This is an inconvenient issue and att should deal with issues at stores and representatives who make mistakes on att customer accounts!  Please help!