The electric company will not investigate. This must be settled by the people involved. If you have your electrician disconnect the pump, which you have the right to do absent an agreement that you supply the power for the pump, the park owner may start an action to evict your mobile home, which they have the right to do. So negotiate this matter. Or if they say that the pump is not running on your nickle, turn off or disconnect anything you wish that is being billed to you.
Some jurisdictions forbid the setting up in a new location mobile homes that are older than certain dates or that are built of certain exterior materials. Yours might, or might not, be one that cannot be relocated in your area.

Thanks for the heads up about what the mobile home park owner has the right to do. I am hoping to settle this amicably so hopefully it won't come to that. So far I have remained pleasant while reporting this matter to the manager and waiting for a response from them.