Unknown Debit

My mother received a suspicious SMS from a number that appears to be in the Maldives to tell her that her bank account would be debited by Momentum. As she did not recall having a policy with Momentum, we contacted the ***** division. They told us the SMS appears to be suspicious and to block it. We blocked it. Yesterday, a debit order in the amount appearing in the SMS went through. We tried now to phone two of the numbers listed on the Momentum website. Neither of them are valid numbers.

Could someone please contact us so we can find out if it was in fact Momentum debiting my mother's account, despite what the ***** division said, and, if so, why her account was debited.