Voda bucks complaint

I redeemed 300 VodaBucks for the bus booking discount on the 31st December 2019.i recieved a text with a Ref No and instructions on how to book in order to recieve the discounts. The options are to either call *** or send a whatsapp message on *** . I decided to call *** . I was on hold with vodacom for over an hour and a half with no assistance. I decided to send a whatsapp message for assistance. I was sent a link to follow for bookings I followed the link. But when I entered the ref no on the text I recieved from vodacom it said it was invalid. I went back to send a whatsapp message telling them that it said my Ref No was invalid. I did not recieve any response from Vodacom. I sent several text messages without getting any assistance.