Burger King Drive-thru Money Laundering/Bad Management Greensboro North Carolina

On yesterday, Sat. Feb 17th my daughter sent me to Burger King for her and my niece she gave me a $10 bill. I went through the drive-thru, ordered two strawberry banana smoothies. The gentleman repeated what I ordered and told me to come to the window. I get to the window he hands me to strawberry smoothies gave me my receipt change I just tucked it between my legs he stuck his head out the window he said I charged you for two smoothies okay I said okay and drove off not even looking at the receipt or the money. I got to the stop sign which is directly in front of Burger King Ithought to myself, let me check my change so I check my change and I have $2.85 change. I thought to myself no that's not right I should have at least close to $4 back so I looked at the receipt and on the receipt I noticed he charged me for one smoothie and put in the system I gave him a $5 bill which I did not give him a $5 bill I gave him a $10 bill because I did not even have a $5 bill my daughter sent a $10 bill the receipt had on it he charged me for one smoothie $3.09 and put in I gave him a $5 bill and a dollar and nonsense change but he gave me back $2.85 change and I felt that he should be giving me back close to $4 change so there is a serious mix up here. I am mediately pulled back around to the drive-thru window now keep in mind I was in a rush I was on my way somewhere but I wanted to drop my daughter and my niece smoothies back off before I went somewhere I hurried pulled back to the drive-thru window there was a woman's voice she told me to pull back to the window cuz I explained to her out there was an issue with my order I pulled around to the drive-thru window there was a woman who stuck her head out the window and I explain to her what was going on then another lady came to the window and stuck her head out the window said her name was Kathy the manager I explain to her this receipt and this change is not right and I explain to her I gave the gentleman a $10 bill but the receipt says i had given him a $5 bill I explained her I ordered smoothies but on the receipt it says I ordered one smoothie yet still I was given two smoothies by this same young gentleman. the receipt also states he gave me back about one dollar nine cents change but he actually gave me back $2.85 change I explain this to Kathy the manager and gave her back the $2.85 along with the receipt given by the young gentleman. In a hurry kathy, though there were no cars in the Drive-Thru behind or in front of me abruptly brushed me off and said "well I have to count the drawer first so u gone have to wait, pull around the bldgI " I pulled around to the other side of the building about 10 minutes later Kathy the manager came back out. In a hurry very rudely and abruptly said I counted the drawer the drawer is correct so here's the receipt and your $2.85 back it's all correct and no one seen him do anything, no one standing around him seeing anything! " then I said " I don't care about anyone standing around I don't care what your cash drawer says I gave him a $10 bill!" I I demanded to speak to corporate. She responded in a very mean voice that the district manager just had open heart surgery and he will not be back until Monday!" so I offered my condolences and greatest apologies after knowing he had such a major operation as open heart surgery. She would not provide me with his name or any information. So I told her she need to be glad I am in a rush but I did tell her she would be hearing that from me regarding this issue. I asked her to take my name and number she took a piece of paper and Road names and phone number on it and I asked her I said don't you have cameras I said you need to look at the cameras and she just completely brushed me off said she would have the district manager look at the footage when he returns did not say anything else just turned her back to me and walked off. I called the burger king customer service today which is Sunday, Feb. 18th 2018 and filed a complaint of the gentleman and the managers behavior. The district manager has yet to return my call. I feel as if I may be discriminated against by the manager and taken advantage of by the gentleman cashier. No resolution. No answers. Please help.