Revisions are possible but they are complex because you have to locate another source of graft material. If a source isn't available, some consider a Sigmoid Colon Surgery which carries other risks with it. Your best bet right now would be to explore your options with your surgeon.
One thing mentioned elsewhere on the site is not applying enough pressure when dilation. After your healed, you should be able to apply at least 4 pounds of pressure to make sure you reach sufficient depth.