NO CUSTOMER SERVICE

I went to the Markham in Centurion Mall to buy some items. I have a voucher which was SMSed to me and the voucher expires on 30/09/2015. When I go to the till to pay for the items the cashier tell me that the voucher is not valid. I showed them the SMS and they called the customer services which told them that I must come in tomorrow cause there voucher department is closed. <br> 1. It is not my problem that there voucher department is closed and the SMS was evidence that the voucher is still valid.<br> 2. There where no manager on duty to resolve this matter.<br> 3. The cashier (I don't know whats her name) where making rudely sounds at my complaint.<br> <br> If this is not resolved by close of business today I will close my Markham account and support a shop that gives customer service.