Breach of contract?

Progress payments is not being paid as per contract by Standard Bank. This is the second time that the same issue is raised with Standard Bank. After the first incident I thought that all is in place. Now few months on and the same situation arise. Once again I have to go through all the steps just to indicate to the bank that they are in breach of what was explained to us in contract. Again one division and another division of Standard Bank not on the same page.