no pin received

Last week Sunday I bought a electricity voucher. I have sent the message like prompted on the slip and up to date I have not received it. I sent an email asking for help and a sms. I even got the garage where I bought the voucher from to phone their supplier. The supplier came back to me on Wednesday and told me the electricity is of line and my request is in a Que and I should receive it the same day or two. Well we are now on Tuesday and still mo response. A hundred rand is a lot in my life. The serial number for my voucher is ***. Please help I don't know what to do next to get my pin that I need to use.