Rude and not willing to help customer

I had used a coupon from vouchercloud for a purchase which clearly states one per transaction not one per customer however your staff are not willing to assist the customer and resolve the issues even under a different user, the coupon was following all terms and condition yet Mirriam was arguing with me and not giving me a chance to talk insisting that she was correct even after trying to show her the terms and conditions for the voucher.<br> <br> She also refused to run the coupon under my wife's name because she said we are one person even though my wife had her own thank u card, eventually when they tried it under my wife's name, Memory went and purposely put the voucher in wrong and then I'm positive they did something to block my coupon on that till as they tried the same coupon on a different till with another customer which worked and cost me R7 for parking as well as losing out on R120 in discounts, I find this behaviour very unprofessional and ********* for a manager yet they call what I'm doing \*****"when they are *****ing customers who are what your company actually runs on."""