Bad service received at First National Bank

i am both disappointed and disgusted by the service First National Bank offers.last year in September i reported a negative amount that suddenly appeared on my account that i had no clue about. I went to one of their branches and was told they could not trace where the amount was coming from neither could their Head Office be of assistance with regards to this matter.it took them more than 3 months to sort this out and they kept giving me reference numbers that kept pilling up in my storage without any solution to the issue. i then decided i was going to let them investigate and give me feedback.on Saturday the 4th of April 2015,i went to Yeoville branch to find out what the solution was to the problem, to my surprise the account was closed. What annoys me the most is the fact that the consultant who was helping me even gave me attitude when i wanted an explanation on why the account was closed, how was i going to use an account that was under investigation? she just told me she was not going to answer that because she did not close the acc. Is this how they deal with issues or its lack of solutions to customer problems,or is it that they dont care at all about the customers?