Pathetic service to ongoing issue still not resolved

Today I received a call from vodacom to advise they noticed that my number keeps dialing out asa private number and would I like to have this change. I told the very helpful consultant that since January 2020 I have called in several times to ask vodacom to sort the following problem out. I was on a cell c contact which expired end Dec 19. I took out a contract with vodacom in Dec 19. I asked to keep my cell c number and have it ported. This still has not been done. I recieve all inbound calls on my cell c sim which is now pre paid. I recieve no inbound calls on my vodacom sim. I can however make outbound calls on my vodacom sim. Meaning I have to carry two cellphones around so I can recieve calls on my cell c sim and make calls on my vodacom sim. If I switch off my cell c sim then I get no calls as my phone is off. I can not get any inbound calls on my vodacom sim. I can't place my cell c sim in my vodacom cell as it is locked to vodacom. Every time I call in and explain my issues every consultant first reacts with disblief, places me on hold for ten minutes at a time, then comes back saying yes they can see that the line is not fully registered on vodacom that they have logged it with back office and that they are waiting for back office to resolve the issue. The lovely helpful consultant I spoke to today advised she can't see that anyone has raised any ticket on my number. Back office has not been notified of my issue. That for nearly 5 months NOTHING has been done to resolve my issue. I was not surprised. So can some one please advise me why has my issue not been resolved?