Unauthorised debit order

I have money taken off my account to for the amount of R591. I cannot seem to dispute this transaction and I can't get through to get assistance as I keep running out of airtime. I always here stories of people complaining about their Capitec account being **********ly hacked into and I thought they may be exaggerating until now. I want my money reversed as I save that money for emergencies for baby things. Angry and frustrated.