Need help , my dog bit somebody and a company wants me to pay $400 in unexplained expenses?

I understand my dog bit somebody on our property and we have to take responsibility for that bite. No problem there. Sedgwick Claims Management Services wants me to pay nearly $400 in expenses which I would have no problem paying, but they sent me an invoice showing expenses that were added more than once or twice. Then invoice is showing their check numbers which are repeated along with the repeated expense. I tried to contact them regarding the confusing invoice and noticed they sent me the invoice and notice with out a contact number. The notices also states "If you have questions please contact the examiner at the number listed above." There is no number to contact anybody. What should I do? I went to the Sedgwick website and it does not have a number for me to call. I have been told to wait because if they want the money they will call me. But I'm afraid if I wait too long there will be a bigger problem or more fees. Any ideas about who I should contact?

Also, my husband just pointed out, the Sedgwick CMS seem like they do not know anything. They did not spell my name or the street address right and when the report was made we gave animal control officer my name. The one that got bit was with a delivery company so you would think they have the name of the street. These are some red flags for us showing us these people may not be who they claim. Any info on Sedgwick CMS would help.