Payment

I have a Foschini Group account. I made a purchase with the card on 22/08/15 at Exact! for 4 items. Because im a new client, i have to pay 15% of the purchase price. i purchased items for more than R600 and payed R150 cash. I paid that so i dont also have to pay the R20 instalment on the 01/09/15. I checked my account statement online on monday. The only payment that reflects on the account is for R100. not R150. i also checked the slips that i received, there was no slip for any payment that I made. I sent 2 emails to [Email Removed] they only responded saying i should send them the slip of the payment. I DONT HAVE THE SLIP OF THE PAYMENT. It was not given to me. Please help me as i want that R50 before i get this to the ombud. please reply to this my 16:30 or latest by Monday! my number is *** or ***. email me on [Email Removed]