Unfair conduct

I accompanied my 68year old father who has a fixed deposit account with fnb. This account's interest is paid montly on a savings accout which they opened for my father so that he can access the interests when in need of cash. On 20/12/2017 my Father and i went to FNB to change the banking card because we noticed it has expired. We also needed cash for household needs. We were told the account is closed becaused it had no funds! That was a suprise to us because the interests are transfered montly to that acvount, so there is no way the account can have insufficient funds. I asked the consultant kindly why did they not inform my father when they were about to close the account but he did not have answeres for me. He then went to another office to enquire about the reason the account was closed and about what happened to interest that was supposed to be paid on the savings account. He said we must go and look for proof of residennce so long so that we can re-open the account. When we came back we had to explain to a new consultant what happened then he too went to another office to enquire and he came with a reason that says: the account was closed because it had no funds. When we asked about the interest he said he is not sure what happened to it but he said he will re- open the account and we will get the interest the following day which was the 22/22/2027. We went to check but nothing was deposited. We find this unfair that no one is able to explain to us as to what happened to the intetests nd why did they not inform my father when they were closing the account. I kindly ask hellopeter to assist in this mattet.