PM in Phoenix has software error.

[David Vander Pol]

I received an email from my PM in Phoenix that said, "On a recent routine audit we found an account code mistake within our software for your property"  and  "As a result, you have not been charged a management fee since March 2020. The management fees that were not charged during that period total $1080."

Obviously, they want their money.

I've been with them for about three years now and aside from this single mistake I am really happy with this PM co. I am happy to pay for services that I have received, and it is ultimately my responsibility to look over my monthly reports. But at the same time, it was their mistake.

Just wondering if I should pay up entirely (which is what I think should be done because I DID receive their services the entire time) or offer that we both share the responsibility of missing this and split the cost 50/50? Or am I being out-of-line here in my thinking?

-Dave