MiWay welcoming vouchers are not welcoming at all!

We joined Miway Insurance on 31st October 2018. In some aspects we have received good service, however, in others, absolutely pathetic service. Just after joining them, we received an email which contained some vouchers as a welcome gift. None of the vouchers worked because when you clicked on them, it just didn't open. I have been complaining about this, saying that I would like to use the R100 Woolies voucher, but since then I have received numerous emails acknowledging my email, but nothing happen after that. I also received numerous phone calls, NOT ONE OF WHICH GAVE ME THE NAME OF A PERSON I CAN SPEAK TO! Today I have three messages saying they tried to call me and I must call back on (011) ********** . When I call back it's the call centre where there is probably a hundred people - which one phoned me? And I am actually not interested in talking to anyone, I just want a voucher that works!!!!