Not keeping promise

On 1 December the LG consultant promise me a memory card as part of the deal (Upgrade of contract) at Vodacom 4U at Carnaval Mall. She said I will get the memory card latest the 6 December 2017. When I tried to phone her she did not answer her phone and now suddenly she is never at the shop if I phone. I whats up her and now she have a very bad attitude and the last 2 days she just not answering my whats up messages. Can LG please keep their promise and deliver the memory card.