The decision:
you have submitted an invitation from the British army which state you have been invitated you for an interview and assessment. I note that the letter provided does not guarantee your enlistment. You have provided no explaination for your apparent new interest in joining the British army and you have nothing to indicate that you have ever sought to join the military of your home

My question is that could there be that maybe someone removed my visa application letter? Because to my understanding it's like I only provided the invitation letter? And the bank balance from my business account show I have enough money that there is no resonable reason for me to go and do the assessment which am not sure of being enlisted. The the bank balance is 8000pounds and my budget was to use 4500 because I don't know what's out therefore I needed to be financial stable yet they have used it as I have money and I cant go to UK for just an assessment and spend that amount forgetting there is air ticket, hotel bookings, logistics plus pocket money.
And there decision I can not apeal why?