Service cancelled

I received an SMS from Vodacom to inform me that they will discontinue their Twincall service. I am using my cell phone as a business tool and it is crucial to my business. The assigned twincall number over time became the preferred number and is known to my customers, colleagues and friends. On receiving this notification I contacted Vodacom to change this number to my Primary number. Initially I was told that this is a simple process, and it can be done while I wait, but after the 3rd call I realised that this was an absolute lie and nothing has been done. On the 14th of November I contacted them for the third time, and received a reference number for the call. I received a call from Nellie - the agent a few days later, who told me that the matter is being attended to. Today, on 30 November, my number stopped working altogether. No calls in or out. After spending 1.25 hours on the phone to them, trying to explain the impact on my business we are no closer to finding a solution. I eventually contacted the complaints department, who promised to get this resolved. As I am writing this, I have had no response yet, and no cell phone service. The impact on my business is severe.