Capitec refuses to refuses to reverse unauthorised debit

We used rain for internet and our deal was month to month, until we moved and rain couldn't work in our new place. Then opted for another internet service, we got the shock this morning realizing that rain had debited 1606.97 in total in two deductions. What dissapointed me even more is the inability of Capitec to reverse an unjustly debit. Capitec is proving to be useless, does this mean, money can leave my account and there's nothing they gonna do about it?