Sean Kingston Being Sued By Avi Da Jeweler

NYC jeweler is suing Sean Kingston for non payment of several jewelry pieces. Singer Sean Kingston supposedly recieved over 200,000 in jewelry from Avi Da Jeweler between 2008-2013 and never paid. The jewelery company claims Kingston paid with checks everytime and they all bounced. What I don't understand is why the jewelery company continued to accept checks from him for five years if the checks were bouncing?