You have done everything that you can. But there are a couple of things I would suggest. The first thing I would suggest is that you talk to your DSO and explain to them the situation. Have them talk to the civic people and see if they can allow your service reinstatement based upon evidence of withdrawal or request for withdrawal. They may not be able to but it's worth a try.
The second thing you can do is try to reach the Tier-2 USCIS officer over the phone with your employer, manager, HR person or somebody from the office. Once you get to a Tier-2 officer, talk to them and explain the situation and ask them for a suggestion.