Ask the managing agent for copies of the invoices for the $1,309.00 and $11,715.00. Look out for the gaps I found when I faced a similar issue in my strata. While I got the invoices they were scant on detail:
* No exact date of when the person attended (just the month)
* No details as to what exactly was done
* No details as to who was sent by the cleaning company
* No mention who on the committee inspected the work claimed to have been performed and approved payment.