They gave me a option off R99 per month, and just before i gave my Bank approval for the Debit Order they phoned me and change the policy to R150 per month and that was not what we agreed upon

They gave me a option off R99 per month, and just before i gave my Bank approval for the Debit Order they phoned me and change the policy to R150 per month and that was not what we agreed upon. I wonder how many peole give approval for Debit Order and then they change the agreement.