RCS VIP Fashion card fees

Hi<br> <br> I recently went shopping at the Mango store at the Waterfront and they told me if i signed up for the RCS card I could get a 10% discount and there would be no documentation required but of course interest fees if i bought on credit. I thought why not and provided by details but paid the amount owing in full. A few weeks later I start to receive sms's on amounts due and then received a statement with a R100 initiation fee and R4 insurance per month. I was never made aware of or agreed to any of fees upfront and it seems like a con as now i suddenly own this money and insurance fee which i never agreed to.