Not my problem

I sent one of my staff to purchase neotel airtime for R100 and sent a sample voucher with to ensure the correct airtime was purchased.I was in no hurry to load the airtime and only attempted to the following day but it would not load.I called neotel and was advised that it was not their voucher.I then sent my staff member back with a letter requesting an exchange as it seemed to have been an error by the cashier.Bearing in mind the voucher did not state any service provider on it so I had no reason to question whether it was incorrect when I received it.The cashier's response was \not my problem,sell it to someone else\" I then went in personally to try and speak to the store manager.during my explanation of what had occurred I was interrupted mid sentence and told he does not reimburse for prepaid vouchers especially a day later.Firstly I was hoping to exchange the voucher for the correct one and secondly the error was not on my side.His response angered me to the point that I chose to rather walk out than argue.I will no longer support this branch both on a personal or business capacity. Not even tiniest effort was made to resolve THEIR error."