Clean Sweep BM

We purchased a Dealfind voucher for window cleaning. The voucher said they would clean up to a 2500 sq/ft home for $79. When they showed up they said it was only for 15 windows and said the voucher had changed. They then charged us another $150 to complete all the windows in our 2100 sq/ft home.
They were completely unprepared for the job as they had only a small ladder and improper tools. End result was the windows were full of water spots when they were done as they had no idea how to clean windows.
This is a cleaning company and I think if you had them do that they would be fine, but avoid them for cleaning windows as they have no idea what they are doing.