Hi MJ2, I'm sorry that you got rejected. I think you probably have a basis for appeal. You have both lead statement and a substantial number of main duties on your reference letter, and we have seen so far several people who have their negative decision due to job description mismatch overturned (aidina and hooman2012 came to mind; though hooman2012 eventually got rejected for a different reason).
Send them an email as soon as possible, highlighting the part why you think your job descriptions contain lead statement and main duties. While waiting for their response, prepare as much as you can for re-application. While aidina wasted 1,100 for nothing (since his first application eventually got approved), hooman2012 actually saved up some time because his first application eventually got rejected. Several people got rejected for missing lead statement, even though their updated reference letter has the magical word "assist". They appealed, and the decisions got overturned. You should try to do the same, while at the same time, not wasting your time to re-apply (since there is always a chance that they will reject your appeal for reconsideration).
Prepare for educational assessments, re-take IELTS if necessary, and prepare all of the police certificates all over again. Let us know, and good luck.