Sorry, I don’t know much of how they try to enforce Army service. I have heard of people successfully arguing with them to let off (perhaps in Israel itself, not sure about through the consulate) after they were giving them a hard time about past due Army service. But, again, I don’t know much of any details on this area. Perhaps you can find someone familiar with how to best resolve the situation to have them agree to relieve your husband of any purported military obligations. (A lawyer might be an option if affordable. Otherwise you should ask around people who dealt with similar problems.)
BTW, I doubt your husband will be able to renounce his citizenship while his Army obligations remain unresolved. Perhaps you can renounce it for yourself and hopefully your children. But people with outstanding military service is one of the reasons they usually will refuse to allow one to renounce it for. Come to think of it, it may complicate renouncing your children’s citizenship if your husband remains a citizen, since children of citizens are citizens. Even if you renounce it for yourself prior to the child being born may possibly not prevent your child from being a citizen if your husband remains one. It might be a better idea to renounce yours together with your new child’s simultaneously after he is iy”h born, (though you will still have the same issue for future children iy”h since your husband remains a citizen) although you need to verify if you can even do this. (Essentially the question is if both parents are citizens, can one parent renounce their citizenship AND their children’s citizenship if the other parent remains a citizen.)
Another facet is that if both parents (i.e. you and your husband) were born outside Israel and are only citizens of Israel due to your parents citizenship, it may be that your children born outside Israel never in fact acquired Israeli citizenship in the first place, and therefore you have no problem for them altogether.
Good luck.