I believe in you that I will be assisted

Good day

Kindly assist I bought mtn airtime of R30 so I lost voucher number I went back where I bought airtime they reprint the slip and asked me to call service provider and give them the serial number and date time and place I bought airtime as they will retrieve the voucher number I called mtn twice they advice that they can't help I must have voucher number I asked about serial number as each airtime voucher has its own serial number they advised it's a loss for me Please help as i don't wanna loose money I spent on that airtime