What should we do if our visa applications are delayed and the consulate is unresponsive?

Advise please! We are a family who are in HCMC in Vietnam and applying for DTVs. My husband had his approved on the 4th March and we submitted mine and our kids as dependents after that. We were asked for additional documents on the 10th and uploaded those that same day. We have been here now for 4 weeks and our kids are going a bit crazy. The consulate doesn’t pick up the phone and we’ve emailed but no replies. Any advice on how we can check what timeframe we might be looking at or any suggestions for what else we can do to find out? P.s. I know it can take time, so only helpful or supportive comments please! 🙏