Diamond Precision

I just bought a house in Overland Park and I was told the work done on the house was guaranteed for a year Even when first moving in Benson from Diamond Precision told me to watch the leak he fixed in the corner of the house and from the first rain we got, that corner was leakingI contacted him and he told me he would fix it once the weather dried out I have contacted him many times via phone and text and he has not responded to me to address this issue I moved in at the end of June, That corner is continuing to leak in the basement with all the rain we have hadI don't know what else to do, he won't return my phone calls