E voacher purchase while I'm the only person with it .

Myhusband boaght me a voucher for Mothers day on the 13th May 2023 for R1200. On Monday the 15th I went to Mall of the north to redeem the E vouchers and boaght 2 watches for R599 Total was R1198.They told me the voucher was redeemed that morning I asked it's impossible because E voucher it's they send Sms directly to me even myhusband doesn't have voacher number it was send to me directly via sms from them . How come the purchase it's exactly the same amount I'm purching for R1198 they said I'm left with R2. Manager said he think the voucher went through it's system error. They called head office asking where was the voucher redeemed they said mall of Africa . They checked on the sells for that day at Mall of Africa and they show me the was no sells for R1198 and even Mall of the North the was no sell for R1198. They said they will send email and give me feedback it will take 3 to 5 working days. Today it's the 9th day no feedback . I can't loose my E voacher like that while I'm 100% I'm the only person I have it on my phone and I don't share my phone with someone. Their not taking their customers very serious their so quiet because it's not their money .