I would ask them for a copy of the invoice paid and check to make sure the contractor is licensed.

One of my managers charges 10% for any invoice through another company. 

@Patricia Andriolo-BullYour attorney is probably correct as you most likely will spend more than $6k to defend the claimIf I were you though I would thoroughly read through their claims and start putting together a response.The other thing to consider is for the money you withheld, did you actually perform the repairs and keep invoices or was it what you thought the cost was?

Sorry, I'm not paying whatever ridiculous handyman invoice that the PM passes onto me for such a simple "fix". 

Are all my invoices uploaded to my owner portal?

Once you get a duns number go to quill.com and order about $25 bucks worth of stuff and click the option in checkout as invoice me pay later.

As a property manager we can pay utility invoices, landscaping invoices, service repairs, HOA fees, etc on behalf of our clients.

Aloha,You should require copies of every paid invoice.

But I’ve also received invoices rounded off like that.

Let's say I do a kitchen remodel and I get an itemized invoice from my contractor which breaks down the remodel into: $1500 for plumbing, $1000 for electrical, $2200 for cabinets, $1500 for granite and $1000 to remove a wall and drywall/paint.