Edgars R600 voucher ****

So Edgars ran a promotion of when you buy for R600 they’ll give you another R600 and then went and bought. Got the voucher a week ago when i tried to use the voucher was told cannot use it first need to pay because my account is overselling and asked what does my account have to do with the voucher and the answer was those are terms and conditions and looked for the terms and conditions and it’s not there so what are they trying to do ‘**** me’ becasue you cannot come up with terms and conditions after i’ve spent my money. Right now i dont even know how dis my account oversell because the last time i checked i still had credit but now im told here’s the voucher but guess what you need to pay first before you can use it. I will be reporting this further because i was misled when i bought for R600, they made me buy thinking will get the R600 voucher but turned on me with terma and conditions that didnt exist still have the text with terms and conditions.