In what sense - all you have stated is that you can void a contract if the banks alter it to your detriment by increasing their charges. I do not see that this is any help here.
Unless they change their charges after you open the account, the banks haven't altered any contract to your detriment - and even if they do change their charges, and they notify you of that change before they apply them, (which will also be one of the terms, that they can do that) you have the option to close your account and go elsewhere if you don't agree to the new charges, so you do not have to pay them. By no