Frustrated standard bank customer

i opened an account with you guys about a week and a few days ago, on the very same day i deposited money to make sure my account is active.

This past weekend i went to the shops to purchase groceries and i tried to swipe using my card but it was declined and i tried using the online app to just purchase airtime and nothing works

I called several times and most of your call centre agents told me they do not know what's wrong. I called in for the last time only to find out my account was blocked, for what reason i do not know and how do you block or freeze somebody's account without informing me. It is completely unacceptable and unprofessional, we are under self isolation and quarantine i have no branch close to me and most of your call centers i have contacted seem i competent and can not assist me.