Poor Structure - Brand New House Full of cracks All over

.My house is less than 3years of occupation and is full of Cracks everywhere inside and outside the house. I called client care and spoke to Caroline Stenkemp who promised that my is under 5years warranty to fix such and after assessment Khosi Ntshingila and Elrine send me a report to say l am liable to fix for to fix all those cracks and also l can escalate my issue to NHRBC.Nonses.Cosmo please take ownership and fix this poor workmanship. I want my house fix. This is not fair at all that l need to fix their mess and now we call them they don't answer their phone