Bad Service and Bad Attitude

I'm very disappointed by the service rendered by Vereeniging Hungry Lion.. on the 24th of December I went to Hungry Lion in order to utilise the Coupons I have won with Vodacom.. I had R600 worth of coupons..however when I arrived there the teller was willing to assist but a lady I'm not sure if she's a supervisor there came to the front to inform the teller I cannot use more than two coupons and with attitude.. My question is.. why is Hungry lion partnering with @Vodacom if they know they cannot render the services?...