refunds

HI Team

I have a supplier with two business names,  I paid their invoice twice, so it didn't get picked up.   

they have returned the overpayment,    I thought I followed the steps to correct the credit but it was coming up in my bank un reconciled so i deleted that entry now I have unpaid payables appearing.

not certain how to fix it as I dont want to pay the supplier again. 

the account under family trust is not balanced........  ( the amounts dont appear the same as we got a discount)

I paid the same invoice via Myob Payable banking  and one via direct eft payment.  

regards

miriam