shaky,
All your Citizenship (N-400) related documents are at the BCIS District Office that has jurisdiction over your residential address. In other words, if you haven't moved since your interview, they are still in that same office where you took your Citizenship interview.
The operators at the National Customer Service Center will not be able to give you any status on what's happening with your case, at your local BCIS District Office. So, calling them as you have already realised, will not yield any new information.
If you make written inquiries at your local BCIS District Office, it may further delay your case. Wait patiently at least for six months, from the time of your interview. It's most likely you'll get an Oath letter by then.
If you don't hear anything from BCIS for six months, make a personal visit to your Local BCIS District Office with your Citizenship papers, ask to see a BCIS supervisor, explain your wait to them, and request them to check your file to find out what's causing the delay. If you are unable to find anything from them, then at that point, make a written inquiry to your Local BCIS District Office.
If you do get the Oath letter by then, you can take all your traffic related tickets, receipts and payment information with you, to the Oath Ceremony. It is very unlikely you'll need any of that during the Oath ceremony, but it won't hurt to have them with you. Also, only provide them if they specifically ask you for your traffic payment receipts. It is very unlikely they'll ask you anything about your traffic tickets, during your Oath.
Good luck!