I deposited N20,000 Into my eldest sister first bank account from ughelli delta state on Tuesday 31st of July 2018. through that their ancient deposit box and left, although after asking the cashier behind it if I can pay 20K through it and she said yes.

24hrs later my eldest sister called me, she said she had never received any alert concerning the money I deposited and I returned to the bank and make inquiring.
At first I thought because I use the old box system but it turns out not to be the cause.
.
They claim the money is in the account and they spoke to her to tell her I actually deposited but that someone has withdraw different amounts of money at different interval from the said account,she is unaware of it and also she never received alert of the deposit and the withdrawals.
she became trouble and worried.

She went to a first bank branch in warri to verify and they told her the same thing that I paid and some other people withdraw money from the accounts.
She ask for details of the people withdrawing the money but they said she should not worried about the money that they will resolved it before next Tuesday 7th August 2018.

She called me that they advice her to go home that they are on top of the matter. I suggested to her that she should withdraw whatever is left pending when the matter will be resolved. According to her the cashier was angry why she wants to do that after all the assurances,but have to choice than to do what she want.

They later before the 7th of August 2018 sent her a text with a phone number she can call. That the matter have been resolved,she called back telling them she is yet to receive the money.

After wasting all her phone credit and time on phone and listening to them they told her to hang on.
Until her phone credit got finished no money revert back to reflect t"the matter have been resolved "

I travel and return today and she narrated all she passed through. With money not return.

What should she do now?

She should go n meet the bank manager if nothing then sue their ass

Get some hard looking men with A.K to go do their job at the bank