R500 paid on Vodapay for an INVALID code. VODAPAY Refuses to help

Marvin TImm and the Vodacom team refuses to assist!! I bought a R500 One Cart voucher through Vodapay. The code is invalid. I contacted Vodacom to assist and the ticket was closed and got an email it is a One Cart problem. Now after spending so much airtime on a call, One Cart says it is Vodacom and they should activate my voucher from their side. So R500 cant be spent on things I needed 2 days ago due to Vodacom / Vodapay's incompetence. Clearly no one feels like working yet and dont care that customers lose large amounts like R500!!!!