Tenant Forging Electronic Payment Receipts

[Kathleen J.]

We have billed our tenants through Quick Books for several years.  In August I unwittingly took on a "Professional Tenant" who is making my life a nightmare.

His September rent was 21 days late.  He insisted his payment issues were due to traveling out of town for his Grandmother's funeral, then some kind of bank glitch.  I became very suspicious of him at that time and started digging deeper into all of his claims during the application process, so I knew that it was likely he was lying.

October & November rents were paid electronically through Quick Books without event.  December nothing came through.  In fact, Quick Books does not even show that he has even VIEWED the December invoice.  When I contacted him after the expiration of my grace period (the 5th) to let him know that if he didn't pay I'd begin the eviction process, he acted offended, claiming that he paid, and forwarded me what appeared to be a PAID email receipt from Quick Books.  The invoice # matched the December invoice, and it showed a payment date in November.  But, the hyperlink did NOT link to the December invoice, but rather to the old November invoice.  My reasonable deduction is that he changed his November payment confirmation to show the December invoice # and an on-time payment.  I was even able to reproduce this by paying creating a small invoice and paying it, and then typing over the details in the message in my email.  

So, we have court next week at which time I need to be able to prove that he did not pay us.  He is the only tenant since 2012 to have ANY problems paying electronically, and I have had 14 tenants across 7 properties.  

How do i prove that he did not pay us?  He seems to be forging his bank statements too to make it seem like he paid.  He also seems to be creating emails that I NEVER received, in which he offered to re-carpet an entire 1700 sf townhouse, as well as a list of repairs that he claims to have undertaken.  I am a FANTASTIC landlord--we fix everything well beyond what is required or expected.

Can my other tenants write letters attesting to my honesty and responsiveness?  Will this have any impact on the court?  This tenant has FIVE residential evictions that were not discovered by my (then) screening service.