The Company name has changed on my lease but I never agreed to it?

Thank you very much for your reply. I have a couple of more questions I would like to get your opinion on if it’s alright with you. Was it legal for the companies to change the name of the company that I signed the lease with before they filed it ? When I signed the original lease in front of a notary the company name was XTO but now, the company name is Ellora Energy Inc. and on the last page of the lease the company name XTO Energy Inc. was scribbled out with a pen and hand written Ellora Energy Inc.