Really sick of Nusteel's lack of response

It seems like Nusteel has a policy of never responding to an email or phone call on the same day or next day or even in several days. It also requires several requests to get a response. We certainly haven't ever had a response from them within 24 hours or from a single request or email for at least the last year of our dealings with them. This is so frustrating and makes us dread what the building process will be like, if it ever starts that is!