Problems using Vodacom Eskom prepaid voucher

I tried to buy a R50 Eskom voucher with Vodabucks and R39. The transaction completed and I received a USSD code and pin number. * My phone refused to access the USSD number telling me I have no airtime but the Vodacom app tells me I have ample minutes, sms's and data * The numbers I found on the Vodacom website are no longer in use. The new number in the voicemail led to a call centre which then led to 4 transfers to different departments. The final transfer led to another cutoff as I apparently did not have the airtime to phone them. * My husband tried to access the USSD and got an error message - Meter failed. Please confirm details. Starting to feel like I have been ****med by Vodacom on multiple levels