REJECT FOOD DELIVERY

I would like to seek legal advice what is the violation i can complain against the food chain after accepting my order online the branch reject my order due to the reason that they experience complaint in our area. Because of that complaint they will not accept delivery to us. I told them that i am not the one who complain against them. Then they make alibi that our barangay is too far in their location. But we are in the same municipality and there is no any branch can make a delivery to us but their branch only. Then, one thing is that i order in behalf of my son who is PWD. Where can i also file a complaint against their establishment? Please help me. I want them to learn from their mistakes and to fight for my constitutional and customer rights. I feel so disappointed for their reasoning. Thanks and God Bless. I hope you can help me.