No one helps

my mom upgraded to a Samsung tablet in 2017, this product is still under warranty and stop charging. we visited the store in clear-water mall which referred us to the Samsung as cellc representatives could not assist me. when we got to the Samsung store we were then referred to the i fix store as Samsung did not have stock to fix the fault. After much debate with the Samsung representative we finally left and went to the i-fix store. Upon arrival at the ifix store the lady refused to assist us as she stated the proof of purchase date does not correspond with tyhe activation date therefore she cannot book the phone in? Seriously? so because cellc C purchased the phone a month before I app**** for the upgrade i'm not able to get the product fixed under the warranty? This is such awesome service. I will not be going to another store, Cellc will now collect the unit from my address have the phone fixed and delivered back to me once it is fixed.