How do you sort out differences? You can hold out and wait for the counter party to come apologising for the misunderstanding and then initiate the reconciliation process, however experience has taught me that this route rarely works!!
It is more gratifying to reach out to your counterparty and initiate the reconciliation process and especially if you have been wronged. It not only gives you an edge in the discussions but also builds trust in your future dealings with the party in question.
To err is human but to cut someone some slack is noble