Dealing with Contractors is Like Bad Dating

While preparing my condo for rental I decided to use contractors for repairs, painting and cleaning. In the initial phases of communication they were responsive. In performing their work they were competant. When I handed them the checks they were pleasant, even if their palms were sweaty. But when I asked for invoices and receipts they were elusive and then unresponsive. So much like dating - you put out or payout and then there's no reason for them to return your call.