I have had a number of pay issues over the last 7 years, in total the military has told me I owed them in excess of £22000!! Some of it was the current AiP fiasco, now resolved in my favour, the other was a very large amount and the final turd in the water pipe was £1200 deducted with no warning (another AiP screw up on JPACs side). I warned my CoC enough was enough, letters and meetings with my MP got the right questions asked to the right people and half a dozen letters from the Houses of Parliament sorted the problem out. My advice: cause as much of a stink as possible, write to your CoC stating the impact on you personally, morale in general and possible loyalty and trust issues. Involve your MP as an option, they are paid and voted in to represent you; the fact you are an ex or current Service person is irrelevant. Good luck.