M.M.
What do you WANT to have done? Do you want to sue? Do you want the pediatric office shut down?
I understand you're mad, but I don't think you're clearly thinking through here. What, realistically, do you expect to have happen? If you push this, at most, the office will get fined for lack of paperwork due to HIPPA (provided that there was none that was mistakenly not provided to you).
Your child will be fine. He will not be scarred for life from receiveing 1 vaccination. That is the reason that there are many boosters of all of these shots. And for the record, those of us that do follow all vaccinations...our kids are fine. Mine have never had an adverse reaction - in any way - to what they've received.
Obviously you're seeing some redness around the site, so that would indicate a reaction for your child. But I think you may be looking for things you can blame this accident for.
Stuff happens. It's done.
So try to see through the cloud of anger right now, and think, realistically what you want to see happen here with this office. And then, realistically, what's ACTUALLY going to happen. I'm going to suggest that no matter how far you take this, you're not going to be satisfied with the end result.
Switch pediatricians, and try to move on.
I'm sorry this has happened to your family.