DISPUTE WITH BANK

In and on 19 June 2012 I opened an FNB SAVINGS POCKET For my Encore account with FNB . I was advised that to pay less or no bank charges I had to open a savings account in the amount of R10000 to be held by the bank attracting a low rate of interest to qualify for the fee reduction. I recently asked what happened to my account as it didnt show on my internet banking only to be told by the very helpful lady at FNB Kloof that the account was closed. I denied closing the account or knowing about that. The assistant ascertained that the bank closed my account in September 2016 and put the money into a dormant account. I have been a client for well over 26 years with FNB. at no time were they without my ID, ADDRESS, CELL NUMBER. I WAS NEVER NOTIFIED THAT MOVEMENT OTHER THAN INTEREST WAS DUE ON THE ACCOUNT. they also FICA'd me, so no excuse there. They eventually found the money and have refunded me less than my last statement dd 30 Sept. 2016. No. apologies no explanation no interest to date. I therefore request that they re look their negligence, refund my (a) full interest to date; (b) review my bank charges to date and refund me the difference to to me as well. Am I being silly, I think not, I cannot believe what has transpired and I would like answers which are not forcoming.