instant money

I was sent money via spar, instant money voucher. I went to the ATM in johannesburg cbd at the bridge, I tried withdrawing it and It told me that there is a problem and I must try again later, I went to another ATM to try again and then it told me that the voucher number has already been used. I been calling the queries service provider and for the past two hours I have been on hold or it says the network is congested.