What happens when a National Guard unit misses your pay when you're in between units?

So, In August, I was told I had finally been promoted to a slot in another unit, and my PCS was effective, that I would need to report to my new unit for drill the following month, September. A week later, I got a call from the platoon sgt. at my old unit whom instructed me to report to drill with them, so as to participate in Annual PHS, saving my new unit the hassle of finding me a time and date to attend PHS.

So, I go with my old unit, spend all day there, and finally get dismissed. 2 weeks later, I noticed I hadn't gotten paid like usual, so instead of bothering either admin NCO, I decided to wait a little longer incase the pay hadn't been processed yet.

Next drill rolls around, october, and still hadn't been paid so I mention it to my new units Admin and readiness NCO, and they tell me they look into it.

The next month, November, having heard nothing, I asked for the status, and was told there is nothing that could be done about it, due to the fact that the old unit did not have me on their books to pay me, and the new unit did not know to start paying me. And that since the missed pay was for the previous fiscal year, September, that all the money allocated to pay for that drill had been spent and there was no money.

So my biggest question is, does my having a contract for my services with the US government not protect me from being infringed upon with my pay? Or can they do just that?

I find it hard to believe that I come to work and just because some one else goofed I don't get paid. Its not about the money, I dont need the money. Its the principle, especially in that of a new unit.