My band has been rehearsing at the same studio for about 3 years. We typically pay cash, but a couple of weeks ago I paid with a check for the first time. Today, I was going over my bank statements online and saw that the check I gave for $80 was forged to show $180. I have a copy of the invoice and the carbon copy of my original check for $80, as well as the scanned deposited check that says $180. These guys also staple the cash/check to the invoice when we pay. I called the place today and the guy (who was there when we rehearsed and who took my check) said "call Monday morning and speak with the manager." Other than this incident, the place has been great and I would not want to stop rehearsing there. What would you do?