unwilling to assist or give alternative solution

Bought an airtime voucher on my way home at a shop for my son. When I got home he punched in the voucher got an error message \voucher does not exist\". I called customer service and spoke to one of the call center agents and she told me that the voucher was used on 7 April 2016. I told her the date on the voucher I bought was 2016-04-10 and the time 18h47. she then told me that I need to take the voucher back to the store where I bought it from. I told her that the shop was approx. 20km away and that it was impossible for me to go back. She said that there was nothing she can do about it as the are just the CUSTOMER SERVICE. What I have now learnt from cellc is that they don't care about their customers. I'm sure there was some other kind of solution that the CUSTOMER SERVICE agent could have given, but she didn't want too. For me it wasn't the amount that I spent on the voucher, but the principal, because the system printed the voucher not the shop owner, thus the problem lies with CellC and not the owner."