Very frustrated with and sad about my inability to use the purchased Telkom Worldcall voucher

Hello. I have been struggling for months now to use my Telkom Worldcall voucher because the 10136 number that one is supposed to dial in order to use the voucher, is still "temporarily not available" since 14 June 2021. I tried unsuccessfully on numerous occasions to get assistance by calling Telkom's 1023. All I am advised to do is to call 10903 or 81180 which give a "hung up" tone.

I have been using the Telkom World call to make personal calls from my office phone so I do not misuse the employer's phone resources. Now I am forced to use my cell phone which is way more expensive. Also, what am I to do with the Worldcall vouchers that I purchased but cannot use? Please help fix this. Thanks