Unacceptable Vodacom Porting Service

My number was ported from Vodacom to Cell C in 2016. My number is currently active on the Cell C network and is currently in use. My number was registered on the Vodacom network and allocated to a new contract holder on the 11th of February 2020 and again in October 2020. Personal information of the new contract holder ON VODACOM NETWORK is being sent to the my number ON THE CELL C NETWORK and vice versa. Vodacom stated that the number is registered on the Vodacom network. THIS IS INCORRECT AS THE NUMBER IS REGISTERED ON CELL C. Cell C has confirmed that the number has been ported and is registered to Cell C. The number porting status on https://www.porting.co.za/PublicWebsite/ states that my number "has been ported and is serviced by CELLC." After further investigation it was found that phone calls occasionally get routed to the same number on both networks. Personal information (banking details, personal information, etc.) are being received on both users mobile devices on the same number on both networks. This needs to be dealt with seriously and is unacceptable.