If a lease is up does the lessor have the right to renew the lease without clear consent from the lessee?

My company entered into a 5 year lease agreement on a piece of office equipment 5 years ago. The lease was up in July of this year. In February we requested a buy out option, but then did not move forward with the option until later. Now the buy out option has increased and the lease renewed without our consent. The equipment is not valued at what they are requiring for a buy out. What recourse do we have if any? We do not want to continue the lease, but do not want to run the risk of returning the 5 year old equipment and being charged both shipping fees and any fees for repair of the machine in the event of damage during shipping. Nor do we want to pay more than the machine is worth to get out of the lease.