Inadequate policy and rude staff

I recently purchased 3 products at clicks on their black Friday special, 20% for 1, 30% for 2 and 40% for 3. I realised the 3rd product an iron pad was not correct and required the iron sleeve. Both the mat and sleeve were the same price. It should have been a simple swap on the old sales items. However i was asked to pay more. I asked how that would make sense to which the cashier was quite rude and said she needed to call someone else to explain while also complaining to another customer "the things we deal with"

Absolutely poor, given that the current policy doesnt make any sense. Either way, i requested to be refunded and made a pointed note that the policy was **** because it also meant that i have managed to get a 40% discount for just two products.

Do better.

Also your cashiers need to be trained on what "difficult" is when i had a legitimate query.

Thanks for the unearned discount.