Complaint- Online purchase

On the 22 November 2018 I intended to use my R 50 voucher under H07-KHTT-B4CA-6KP3. I attended at the Chatsworth Clicks and was assisted by management Kershnie Subramoney for an hour however I was unsuccessful with my transaction. The call centre was also contacted twice during this period however they were not very helpful. I was told to resubmit and try again when I returned home however all attempts proved fruitless. Further note that I am 8 months pregnant and had to stand in the store during this hour. It was quite a frustrating experience and I was unhappy with the online process which was not user friendly.And worst of all was that I lost my R 50 voucher which expired.