Inconsistent Returns Policy resulted in me not being able to return or even exchange and item.

Truly shocking Returns Policy. We purchased a silver chain with a saphire stone. I received the same sized chain as a gift and wanted to return the one I bought. It was bought on the 28th September and I tried to return on the 11th October. I checked online what the returns policy states and it said 10 working days. Drove all the way to Mall of Africa to make the return as according to me 10 working days is Monday to Friday. They said no it is Monday to Sunday so I was 2 days past the 10 "working" days. This is ******* because why do you state online one policy but instore you have another policy. I even called Centurion Mall's NWJ to get more info and they said that it is 7 days. Wow! this is so incosistent. How are you supposed to know what their policies are if the story changes everytime you try to get info. Not even an exchange is allowed. I am really so dissapointed with their customer service and lack of even understanding.