Real Property Management changed contract and then charged me a fee to get out of it denver Colorado

We agreed to an 18 month lease with our tenants and with the management company but the management company put it in as a 12 month lease that auto renewed. Just before the 18 month lease was up we called to tell the management company that we were selling the house and wouldn't need their services, only to find out that they put it in wrong and now charged us $495 to get out of the contract early. They were hired to find the tenants and deal with collecting rent etc. They didn't find the tenant, we did and we showed the house to them. The company then signed them up initially for a 12 month lease when we specifically said 18 months. The WE had to call the tenants and ask them to change it, which almost lost us the tenants. We also specified that we would do all inspections and that any repairs called in to them would come through us first. They sent someone to the house to do an inspection without notifying us and then charged it to our account. The whole process with this company has been a hassle!