2. An employee calls and tells us he did not receive his pay that was direct deposited to his bank account, NNB. Pike Tanzania’s operations account is at CRDB.
What would you do ?

I don't know what those names and acronyms stand for or where in the world you are, but the answer is pretty much this: tell the employee the account number it was deposited in, the date, and the amount of the transaction (and of course look to see if it was deducted from your bank). The burden is then on him to prove it didn't go through.