Double Booking

This week I've had the unpleasant experience of finding out two weeks before the wedding that one of my vendors is booked for another event on the same day. It wouldn't normally bother me so much, except for the fact that I need them to arrive at our hotel one hour earlier then we previously spoke about, and the vendor threw a fit. That and the fact that I wasn't made aware prior that the vendor would be elsewhere before coming to see us.

(image from here)

The vendor had a not so pleasant phone conversation with my new wedding coordinator that, I could tell after speaking to our coordinator, left a really sour taste in her mouth. I called the vendor to try to resolve the situation myself, and also because said vendor wouldn't speak to my coordinator. Our conversation was not so pleasant as well.

After reading the contract, I realize that when we spoke a month prior the vendor considered the timeline I had then to be the final, agreed upon time. I did not.

I am completely willing to work with the vendor to find a resolution that fits all parties involved, but am still worried that the vendor's behavior will affect how things turn out on the big day. I have requested that they bring extra help, at my expense, otherwise I will have to hire another vendor to also work with us that day to make sure that all is said and done. At this point I would forfeit the entire amount owed if I was to cancel and go elsewhere.

Word to the wise - I wouldn't commit to any specific times (except maybe your venue) earlier then two weeks before the event. Items come up and scheduling constantly changes for the day of the wedding, and this can get tricky if your vendor has more then one wedding booked in the same day.

Have any of you experienced the same change in your wedding day time line that has caused an issue with one of your vendors? If so, how did you go about resolving the situation? Do you think that vendors should let their clients know that they have multiple events in one day?

*Please excuse me for not detailing the specific vendor that this is or getting extremely specific. I would like to keep it as anonymous as possible until the situation is resolved :)