bad service of vadacom canal walk

we were yesterday on the 01st June 2018 at Canal walk Vodacom, MR NGQULANAL helped us and when he hand the Samsung S6 to us, there was an voucher attached and he say it has expired, then when we were today the 2nd June 2018 at Tablebay mall at Vodacom, the assistant told us that there was an email out that the voucher was extended, we phone four times and every time the phone was put down in our ears. Know who have taken the voucher and why did he not told us that the voucher was extended. this is plain theft.