I was happy with our salesperson, but the service ...

I was happy with our salesperson, but the service department is far from competent. What was said would be a few hour job to install a trailer hitch on my van has turned into over 2 whole days. After calling ahead to ensure they had the parts I brought my vehicle in. Only to be told they did not have the harness and they would pick it up and have it done by the end of the day. At the end of the day they said that they'd never done a hitch on a Pacifica before and it would take longer but that it'd be done the next day. It is now day 2. After being told it would be ready at 4pm it is now 5:45 and ever technician is scrambling to figure out why they are getting errrors.