Contractor's Plumber forgot to remove the test ball in a newly built home sewer pipe, sewer backed up into house, flooded bed,bath areas

Moved to Newly built home and used for 8 days. Due to test ball clog, all sewer water collected in 8 days reveresed back into the home when I was doing laundry on 8th day. Plumber accepted it is their mistake by leaving the test ball inside the sewer outlet pipe. This is all video taped, recorded in emails, pictures. Currently home is being repaired, waiting for compensation for the lost things mattress, clothes etc (including 6 month old baby stuff). Baby got rash all over the body probably due to chemicals used for cleaning per the pediatrician. Steroids given to the baby.Will I get a new home as its not worth putting baby's life as risk staying back in the sewer flooded home. if not, How much compensation can I get considering $8,000 worth of lost things, lot of time spent and will spend, anguish mental pain and distress, baby suffering due to the unacceptable msitake of contractors plumber