Share 'Major SEO poblem encountered on Google!'

I hope someone can help me here, One of the hotels I worked with was ranking excellent in the Google search engines under the terms "??? Hotels". In a matter of a month, the hotels website index went from #5 to #114 in Google. I spoke to our website company and asked them what is going with our website optimization and their response was that they don't control indexing of Google. They can only…