Calm down, guy.

My answer to both of them was I am a landlord not a marriage counselor, I suggest you both work this out calmly and I am looking into who has what rights. 

The longer term nature of real estate and IRA investments enable investors to stay calm in the face of temporary setbacks / challenges and allow ample time to execute a turnaround or investment strategy.

Buy and Hold i'd start the cash out waterfall/snowballA heloc sounds appealing for future flips.

Increase the rent a bit and see if that calms things down for you. 

I calmly explain to them that I'm a real estate investor and that the wholesaler didn't know the PIN for the alarm system.

Just check the rules and regs and I am sure you'll fine violations you can site and get these folks to either calm down or get fined so much they want to leave (if they rent).

Amend lease to reflect the new property conditions and the new rent and have them sign and date.3) Request politely that they not use profanity, say you hear that they are upset by the change but unfortunately your hands are tied, and in response to any threats calmly assure them that "Pay rent or quit notice" will be served following the lease guidelines if they do not pay rent.Not legal advice, but that is how I would handle.I would also probably look at selling this property down the road unless the cash flow is really good.

But I have calmed down and and know I need sound processes and plan of action in place.

It helps too, for calming fears in knowing that if they really understand the basics of RE, they know more about RE transactions, legal requirements, financing methods and settlements than 99% of the homeowners they will talk to.