Money withdrawn from bank account

On the 17th October, somebody accessed my bank app. They used a different phone to mine. On the 20th October a total of R8000 was *****ulently withdrawn from the bank account. I reported the Incident on 21 October. From their investigations, they say it was due to a SIM swap that was done on the cell phone number linked to the Bank account, and thus the service provider Vodacom is responsible. Now Im caught between TymeBank and Vodacom. I just need my money back