Catering company giving us an issue

Hi guys!

We are getting married in 18 days! After having to postpone a year ago we are so excited our day is finally here.
When we postponed we pushed all of our vendors our a year. They were all willing to work with us and have been pleasant leading up to the wedding. Lately though the catering company has been giving us an issue. I have a day of coordinator who has been calling all the vendors and making a day of schedule. The catering company spoke to her once and had a question about set up. The coordinator spoke with our venue, but then could never get a hold of the ceterers again. She left 3 voicemails and then we were going to call. Before we had time to they finally called her back and my coordinator said they were very rude to her. My fiancée called just to confirm things on our end, take out the middle man, and also got a voicemail with no call back. When we originally booked it was with someone else who was very friendly and helpful. They said he no longer works for the company so I know nothing about these new people. It's too late to find new caterer and we have already paid half. The way they are acting make me very nervous and I have not paid the second half yet due to this. They did confirm a time with the coordinator though.Should I be worried? What would you do, or did you have a similar situation? It's a local company that makes Mexican food and is well known in the community.