Please Give me some recommendation on how you would handle this situation.

I am one of the owners of a chain of retail stores. Our General Manager at the home office sent a letter to a purchasing agent instructing him not to send purchase orders to our branch offices but to direct them to the home office. What the PA did was put a block on our account which did nto allow them to pull up the local store as a vendor in their computer system. this ulimately cost my company $70,000 in sales last year. This person works directly for my brother at the home office and the letter was not found out for approximately 5 months after it was sent. Since then, we have struggled to build the business back and I am sure it will cost us much more than the $70,000 that we have lost so far.

Please respond!