Poor quality products that dont last more than 6 months

Bought a cobo vanity, sink and mirror set from ctm edenvale, 6 months later the edges start to split. I reported the issue to the manager at the store and head office. All i got was a call from the supplier saying they will investigate the issue, it has been a month now and not resolved. The supplier mentioned they do not cover excessive moisture. my issue is that its a bathroom set, theres definitely going to be moisture. CTM products are poor quality and their after sales service is pathetic.. rather go shop at builders.