FNB - How come you only notice now that my account has been inactive? After you make money out of my accumulated interest you send lawyers to me?

I have since asked FNB to close my cheque account as it was no longer in use. I have sent my previous banker Gwendolin a message on their portal or via phone I do not remember. The account has since not been closed and has accumulated interest while I was not using it. Even when FNB allocated me another banker without my knowledge, I told them to close the account as I no longer use it. Now it has accumulated interest and I get calls from lawyers to request for the accumulated interest. I do not have money now and I don't think its fair that I pay for something I have not been using. Even the Discovery account on my FNB I have since asked them to close the account, I dont use it. They have not called to ask what is up with the account as they see nothing is going in the account but now they can get lawyers to call and ask that I pay for accumulated interest, of an account they should have kept track that it was not being used and they failed to call and ask me reasons if the two private bankers had not communicated this to them or even gave me options how to go about it. I am pretty sure I will be getting a call after this review. Do we need to complain first before we get assistance? The account has not been deposited into, was that not tracked, was that not a concern? or it was a plus for them because they knew soon enough they will call to say I should pay for the accumulated interest? That is a **** then. I do not have money to pay for the accumulated interest.