I want my layby money back

I did a laybye at khayelisha mall at ackermans n my layby was overdue .then i went back wth my id because i lost the slip only to find out that i dnt appear anyway in their computer .so they said they cant gve m back my money but wen i did my layby i left another slip wth them but they didnt even bother to look for the slip.im disappointed because i didnt get my money n its not my fault that im not in their computer