Poor service

I am confused and frustated, i am not sure how much am i supposed to pay my instalment. Now my account is closed. I am paying my instalment every month and dont remember requesting multichoice to debit in my account. I payed on the 28/03/2022. I want to know why my account is closed???? U cant go to my account and debit without my authority while also i am paying at the retail. Unhappy client.