Security Concern

It used to be a simple and convenient banking solution but now I am getting worried about their security. I've had 6 ********** transactions on my savings accounts in the last two weeks from vouchers being sent, payments to a beneficiary that I do not know and now, a failed online transaction using card details of a brand-new card that I barely used. Worst of all you get calls from people acting like they are from the Capitec ***** Department looking into these transactions trying to find out if you have any other types of accounts at any other bank making me think twice and saying that I will rather check in with the local branch. They get persistent and phone from different numbers. It ended up in situation where I had to hear the same old story of how we stole their land and other vulgar comments, unprovoked. How did these people get this level of personal information if they did not work with it, or know someone that does? I have not even registered this new card anywhere online or anywhere where I had to confirm the security code. Is it a coincidence or the same people? It is inconvenient and makes me think twice about recommending their services to others.