Hosting/Multisite

Hello,

My organization recently finished a website design. We have a new host which has moved our site domain and uploaded the new site. However, the site is not pulling up and this process was done on Friday. We are getting the “error establishing a database connection.” Can anyone tell me what the issue is? I can not reach the person that completed this convergence for us right now and we need our site live. Also, we were connected in a WordPress Multisite with a national organization – moving our host away from the national organization was/is the goal. However, when I log into the backside our suppose to be “new site” it shows the “old site” along with the national organization label within our login URL. Should we have created a new WordPress site? Or is this something that will change once the new site has completely converted (if it hasn’t already).