Very disappointed

Very disappointed with the produce bought a bag of potatoes and milk from checkers and the milk is very watery, the bag of potatoes was all off. Called in and was told I should come back to the store with the rotten potatoes and milk. I must now pay for a bolt just to go and complain and to get it replaced. I would prefer that someone comes to me. And I threw the potatoes away and I do have a picture of the bag of potatoes