How would you handle this?

[Carl Schmitt]

I called an expired listing last week and set up a listing appointment. The next day, the house was relisted. When I called the owners, they said that couldn't be possible because they hadn't even seen the agent for a month and a half. They set up an appointment with the previous agent a day before me. Today, I got a call from the agent telling me to "stop spamming my clients, it's not an open listing". I called the homeowner to find out what was going on because we had an appointment scheduled for this afternoon. He said that his wife wanted to stay with the agent and he wasn't very happy about it. I'm not in the business of crossing contracts, so I only wished them good luck, even though the husband said that he wants to talk to me about our company. I said I'd be glad to help him buy something else, but I can't discuss anything because there is a listing contract in place. So, the listing went active again on the 29th of Dec. They did not sign a new contract until yesterday, the 16th of Jan. The agent has the listing plain and simple, but what happens with the almost 3 weeks that it was "listed" with no agreement. How would you handle this? I'm only upset about this because of how the agent spoke to me. If it was me, I would have been VERY polite to the other agent. After all, I can prove that he was marketing the property without a contract...