Sunmar Landscaping

We have issues with cracked stone and shifting, causing large gaps in our walkway that was installed in 2011. I have been calling for 3 years to get 2 pavers replaced. Maria tells me that she tells Mario but he never shows up. She said they have the stone available so that's not the problem. I've even offered to go and pick up the stone myself. I was told that it's not that easy to replace.