After porting to Vodacom I have no signal for more than a week. After having the same number for more than 20 years. No one can fix this???

I ported my number from Cell C to Vodacom. And I got my new SIM card after the number was successfully ported and I was told that the number will work the next day. It’s now more than a week later and my number is just DEAD. No one can get hold of me or I can’t phone or do ANYTHING on my phone. I went back and they phoned the porting department /whatever they fall under and were told to escalate this by sending an email only. After 2 days I went back to the store because I still heard nothing or no one that phones me back. They promised to phone back after feedback today and still nothing from their side or the department or the person working with these matters. I’ve had my number for almost 20 years now I’m stuck and no one can help me.