Unhappy Customer!!!!!

Today Valentine’s Day I went to McDonald’s MONTAQUE GARDENS branch, my friends tried redeeming their free strawberry cheesecake McFlurry and received an error , we asked one of the cashiers to assist us and they refused saying they can’t help for the error !!! Which was fine , then I waited 25 minutes for my order and when I approached the cashier named FAITH she said to me she called the number out already , I said I’m sorry as I went to order again I probably didn’t hear, Faith then grabbed my slip from me went into the back, fetched my order and through the slip back at me and banged the McFlurrys on the counter . I asked them where my free cup was as a bought a medium meal they said to me no it’s only with the medium cheese burger meal, however the app states the free cup is with any meal. I sacrificed my entire lunch to be treated like garbage by Faith from Montaque Gardens branch!!!!!!