I am looking at this and the first thing that pops in my head is did you sign a contract with company A? If you did what are the stipulations of this contract? Did you give them the right to lock you out of it to protect the stability of the website? If you signed a contract I would look very close at it and make sure that you did not sign away any rights. Just cause you are the owner of the site or url does not mean you can do what ever you want if you are in a contract that states this.

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