No assistance from call centre on Airtime transfer error- 3 weeks later

I called the call centre a few weeks ago to report that I keep getting an error msg when trying to transfer airtime to another number. I was told that the airtime transfer service was not activated on my number and that the agent would activate it and it should work within 24 hours. I tried the next day with the same error and called again. This time I was told to recheck and manually add the network to my phone, still it didnt work. On my 3rd call, they told me they would move my query to technical as this was a technical issue. I've since spoken to about 5 different people and nobody can give me feedback on what the problem actually is and how to fix it. I am not impressed as I bought alot of airtime to transfer to another number and now I can't do that. I will not buy more airtime and waste my money because Vodacom doesn't know how to activate my airtime transfer. This should be a basic service that shouldn't be this hard to resolve. Can somebody please get back to me with feedback.