Terrible customer service! (wrong parts)

I paid for parts for a vehicle in full. I spoke to a guy named Terrance. He told me Monday morning it will arrive and i went through coming 35kms away. When I got there, it was the wrong parts. They said come again later and they will have the correct parts. I told him leaving out of town for work so I'm sending my brother to pick up the parts for me. My brother took off from work to come all the way to fetch the parts for me, when he gets there they tell him no they can't do anything because he doesn't have the physical receipt, so I sent him a picture of the receipt and I video called from where I was. And he still gives my brother a hard time. That's poor service, firstly for making me come all the way and having the wrong parts and then doing that to my brother. I'm disappointed to how they treat customers.