Hi kkpan... We are sorry to hear that you are experience some disappointment with your vanity. Although we cannot see your vanity, your sink detaching is a rare occurrence. Although we have spent a great amount of time, effort into our packaging of our products; there are several factors why your sink may have detached. One may be the loosening of the glue during transport and handling. Another, may be that because our vanities are often made, assembled and finished by hand, which could lead to small inconsistencies where maybe the glue was not applied properly. However, we are there for you and would like you to contact us at: 1-866-839-2888 ext. 43. We take customer satisfaction very seriously and we would like the chance to turn your buying experience into a positive one. We appreciate your business and we hope to hear from you. Regards.