Ask HN: Contract help desk support for our SaaS app

I run a small SaaS company. We get 2-5 user tickets a month that go to our helpdesk. I previously had some contractors monitor the help desk and answer tickets (according to a runbook) but they ghosted me and quit without any communication.

Does anyone have a quality agency they recommend that we could engage to monitor our helpdesk? Looking to pay ~$500 / month.

Thanks!