Spending way too much time in futility trying to resolve complaints with Vodacom.

Somehow another person has been issued with my Vodacom cell phone number. I have used this prepaid number for a number of years. Now Vodacom keeps sending me threatening messages to say my account is in arrears. I get daily anonymous phone calls. If I answer these calls, the person on the other side puts down the phone. I even got a message to with the Covid Test results of this person. I sent a detailed account of my complaint to Vodacom, along with copies of the messages. Although I received a reply the very next day, it seems as if the person had not even read my email! Does Vodacom recycle prepaid numbers that are still in use??