Unhappy over service

Due to ill health I could not go make any purchase at Identity Tsakane Mall. I phone their customer service and I did an enquiry. I was tols that I can send my daughter to do purchase on my behalf on my account. I was told to write a permission letter granting my daughter the right to buy on my behalf, together with my Identity document and my Identity card. My daughter to produce her Identity document as well. On Going to the store she, my daughter, was told that they cannot help her do any purchase because my card was not signed,and that I did not state for how much she could buy for. The sales lady the was not very helpful. I phoned the customer care service again and was told by the lady that as long as I have my identity document send because in the past I use to purchase without a card. The customer care lady was hesitating before she could answer me on the signature on the card. I must say sometimes some people can become very difficult in not assisting and helping sort out issues. I must say am very disappointed with their service.