Poor service

I bought R1360.21 worth of groceries from the River Cresent store in Emhalahleni. I was double charged for a melon which i noticed after i got home. I returned to the store with my receipt but was treated poorly and was dismissed by the what i assume was the store manager with a "just refund him" as he walked away. Cost me more in petrol and time to return to the store but i don't like paying for items i did not receive. Apologies to the store manager if i inconvenienced him while he was talking to his buddies.