Billed for closed account!

I closed my personal account August 2016, inside the branch. I was advised to settle my outstanding debt before closing, so I did. Two years later I visit the branch to open an account, so I could cash up on my share saver investment. I am told I owe 2k of fees charged on account. I was told the account was not closed but rather put on hold, and therefore am liable for the fees charged. Please tell me why would I want to continue to pay for a service I am not using? Why was I not informed of the charges piling up on my name?, why was account closed seven months later when usually you close account after 3 months of inactivity? and why must I pay for your agent's mistake?