Worst Ackermans experience ever

I was given a gift voucher that came as a slip, I even went to the store to ask if I can get a card instead of a slip and they said it’s not possible. - So on the 25th of July went to Ackermans festival mall and used the voucher, I had a remaining balance of 642.25 so on the 10th of September I went to Kempton Gate mall to use the balance 1. When I got there I was told I should produce the card that I was given , and I explained I was not given a card, the lady assisting me called the store manager which proceeded to ask me where my original voucher slip was , and I explained to her that the lady at festival mall gave me the slip that I had and took the old 1, she said I won’t need it any more, I should use the new 1 that was issued that day. 2. They explained I had the wrong slip they want the original and called festival mall to trace the receipt and the lady there said she couldn’t find it. 3. The lady proceeded and called customer care where a very rude speaking person said they know nothing about virtual vouchers and cannot help, She called head office and they still said they couldn’t help. 4 I was told to call the person who gave me the voucher so that he can send the sms he received when buying the voucher, unfortunately he changed phones and couldn’t give me the sms. 5. The lady at Kempton gate really tried to help but every call to head office or customer care was unsuccessful, right now I have a R642.25 balance that I cannot use.