Services not Working

Trying for 3 weeks to buy a 12 months upfront bundle, it just says an error occurred. I called Vodacom, they told me if would be resolved in 2 hours and i should try again. A week later i called again, they told me to restart my phone and select some network settings. Still didn't work. Last week i called again, i was told it will be escalated and it will be resolved within 7 days, they gave me a reference number and told me that they will resolve it and get back to me. 2 days ago i got an sms saying that it has been resolved. I tried again. Still not working. I restarted my phone and everything, still not working. Yesterday i got an sms saying that case closed and resolved, but still im trying and its not working. Please assist