What can we do?

I am a cricket wireless dealer and have 8 stores. Three stores are doing poorly and we decided to close them. We have been talking for the past two months with our territory manager about closing them and he agreed. Now he is telling us that we are technically in breach of contract because we did not give 90 days written notice. We asked him why he did not tell us this from before when we asked him for advice and what to do? He was evasive and nervous. Although we have not been served with papers, they have brought other agents to buy our stores and are strongly recommending us to accept any offer in fear that we may lose it all. What can we do?