Please if you are banking with access bank help me explain this cos am tired and frustrated.

For close to two years now access bank took my money and kept it in TOTAL balance
with no explanation

I deposited my account on that faithful day and immediately the sum of 15k was moved to a TOTAL BALANCE


I have gone to the bank several times with no reasonable explanation

I have sent them massages online till now nothing is done

Everyday I wake up seeing my 15k in my account but I can't withdraw.
I asked them to close the account to give me back my money but they refused.
They should explain to me why they kept my money in total balance no reasonable explanation.

Please if you have experienced this what is the way out.