Great merchandise, pity the service sucks

My name is Sharnice and I'm an absolute NIKE fan. When wearing NIKE I feel so good and really feel like I can JUST DO IT. When I wear NIKE I get complemented on how good I look, when I bought it which store I got it from etc. Often I get complimented on how I should research on becoming an ambassador and have often thought about it I even asked a few ladies in the store I usually purchase from if they have any knowledge on how to go about and venture into doing so. Every year I reward myself with a well deserved shopping spree and NIKE is at the top of the list 3 out of 5 outfits are NIKE this year. I started by purchasing a black jumpsuit and even convinced my colleague who had accompanied me to purchase one too at Cresta mall. Initially the jumpsuit I wanted had no size and there was only one left on the rail. I confirmed with the sales lady if by any chance there was any at the back of the store and without checking she said no the one on the rail was the last one as she herself was interested in getting one I took her word for it and continued to purchase my second choice. I had planned to wear this on Christmas day so I had not worn the jumpsuit just fitted it when I got home to make sure I got the right size. So fast forward 2-3 weeks later I walk in the store again to see what else I can find and the excited me spots the jumpsuit I fell in love with in all sizes I decide that I would make the exchange and the floor salesman on duty advises me that it's fine and that I should do it soon as I might not find the size again. Yesterday I walked in the store to simply do the exchange and the sales lady was on duty and recognized me I explained to her that I need to exchange but I however had misplaced or lost the slip. She immediately said that it would not be possible. I had once worked in retail and have knowledge on how things are done. I then reiterated that I have not worn the item and the tag is attached I'm not looking to get a refund but to exchange she says yes but not possible without a slip I asked her to please call the floor supervisor and instead they have a conversation by themselves and she returns asking for the item only to return and say it's not possible as I paid cash and not with a bank card to go back onto the system and check. I then asked her so even if the size was incorrect I wouldn't be able to exchange that she responds saying no as there is no stock for this specific jumpsuit so What if it was a gift and I have no slip would I still get a no. At this point I ask her for the head office number so I can consult with them she gives it to me on a piece of paper the sales lady is now standing with the store supervisor and another lady behind the till. The store supervisor doesn't even care to greet or converse with me they app**** for jobs at NIKE and not me where's the customer service. I leave the store because I have other errands to run and I am on my lunch break but I make the call to "HEAD OFFICE" from my cell as the call to "HEAD OFFICE" was not offered at the store. To my surprise a gentleman answers the call and it's Sandton mall NIKE and not HEAD OFFICE I explained to him and he assured me that he would query on my behalf and it is not necessary for me to call head office as this can be solved easily and he promised to revert back to me which he did in minutes. However the feedback he gave me was not satisfying the staff at Cresta mall gave him all other excuses that they did not explain to me instead they thought him to be a better candidate to do so. I thanked him for his assistance as there was not much he could do from his end. So as I'm prepping for Christmas day I'm not as happy as I usually am and all because I have to wear something I no longer take a liking in at all and in my family Christmas day and dressing up is huge I will be wearing NIKE but don't feel like I can JUST DO IT. At this point I feel like returning all goods if allowed. I also have my birthday coming up on New years day and after this ordeal I will definitely be rocking another brand SAD it won't be my faithful old friend whom I loved NIKE! So to all this reaches the paper slip you receive after purchasing from Nike is definitely worth more than the paper you paid with HOLD ON TO IT UNTIL IT FADES AND THE GARMENT IS NO MORE. The extra star rating is just for the merchandise other then that the service gets one!!!