Dishonoring contract

<p>I received a applcation to join discovery letter on the 22/04/2016 I phoned to confirm that amount was correct and was told it was, I had it signed off and sent it back with all relitive infomation required. Only to find out on 11/05/2016 that it has not started yet do to Discovery changing the amount on the contract with out informing us about it. When I queried what was going on on 13/05/2016 I was told the amount was wrong on the first contract and now I need to pay the correct amount as it was Discovery's fault for the miss infomation, and there is nothing they can do about it. It my problem now. I want this fixed and the origanal contract and agreement between us to be put in place. How can Discovery take their clients/new for such a ride what Bad ********* service. </p>