<human>: Can you condense the text into a few key points?

So I'm at a loss. I currently rent a townhouse from a private owner. Since he works primarily outside the US. He has a friend who manages the house and is the direct contact for any issues I might have (we'll call him the Manager). 

A few days ago, the Manager emailed me saying that I need to switch the electricity account to my name since he got the bill. He requested that I send him a check for the amount. In the lease, it is stated that all utilities are included (HOA takes care of the water, and Landlord is in charge of Electricity). 

I replied back with a copy of the signed lease stating that it was included. The Manager then sent that to the agent they hired to help rent the house, and the landlord. The agent then replied back saying it was a mistake and she would revise and send an addendum to the lease.

I have read over the lease and it doesn't state anywhere that changes can be made if needed. Therefore, is the agent who listed and was in charge of renting the property responsible? How can I go about this?
<bot>: agent who helped rent this property made a mistake and stated Electricity was included, everyone signed the lease. Electricity is NOT included and now she wants to revise.