Disappointing attitude

In my humble opinion customer service is key to building repeat business so it makes sense to try and help a customer. On Saturday afternoon I visited Food *****s Market at Long Beach Mall with the express purpose of buying grated Mozzarella Cheese (7kgs). The cheese was not available grated so I asked the manager Mr John Mitole if he would be able to grate the cheese that was available in blocks. I was very happy to pay for it first. I was promptly told that he was not allowed to grate cheese for customers. I ask him to make a plan but he was insistent he was not allowed to do so, so I left empty handed and pretty frustrated... and you lost a customer. Please look into this. Thanks