General Dynamics Mission Systems Software Engineer II interview questions

I was contacted through email to set up an onsite interview. The interview was relatively easy and only lasted about 1.5-2 hours. I talked with the hiring manager for a bit and then 2 project leads. After giving me an offer I tried contacting the recruiter to negotiate salary and ask some general questions about the offer. I called 2 times and sent 2 emails with no response. After I declined the offer the recruiter got back to me a couple of days later saying they would work on a new salary. I get an email a couple of days after that saying they are still working on the new salary and they will have more information for me in a couple of days. After that email all communication stopped. I tried emailing asking for an update and got nothing in return. To make matters worse they still haven't reimbursed me for the interview like they said they would. I tried emailing about the reimbursement and got the silent treatment. Don't waste your time with this company.