Shoppers Drug Mart review: pc bathroom tissue

Bought today only 1 PC Bathroom Tissue at $3.99 on dec 01, 2019, 12:32pm receipt details
[protected] 3 total $26.51
And I was charged for 2. I was busy unpacking my cart while the cashier has the screen in front of her and packs up my bags as she scans the items through. She is supposed to be attentive to all products charged to customers. It is very frustrating when the customer arrives home and was charged for something they did not buy due to not attentive cashiers.
Thank you
[protected]@hotmail.com
[protected]