Ported to Telkom now Vodacom Users cannot reach me and don't receive SBSA sms's

I have recently moved from Vodacom contract to Vodacom prepaid and now to Telkom contract.Since the move to Telkom Vodacom users cannot reach me,they get number does not exist although when I call them back they can see my number.Also not getting sms's from ABSA on login or transactions.What is the problem and how can it be fixed