My advice would be to fight it out as you state that you are not involved in any integrity issue.
Put up your points to Administration.
That you have actually tackled wrong things happening and informed administration and removed them etc.
I am sure your admin knowns your record.
What is the progress of forensic audit?
What is the evidence on which you have been blamed and suspended?
They are supposed to give subsistence allowance any way.
You need to review your activity fully and see whether any loophole is there which has led to suspension.
What is the kind of extra activity you were supposed to have done as per the email complaint??
Resigning now will indirectly make company more suspicious.
Face up to the problem boldly and in forthright manner.
About money issues it is sad you may have to borrow from parents or close relatives to tide over.
All people need to keep a reserve of money to face such unexpected situations.
Best of luck
16th December 2017 From India, Pune