If you no longer want to continue with your Chapter 13 case, then you need to file a motion to dismiss. Generally you have an absolute right to voluntarily dismiss your Chapter 13 case.
You post is hard for me to understand. If you modified your mortgage payment, isn't the new payment less than the old one? How can it make it harder for you to make Plan payments?You can dismiss a Ch 13 by filing a motion. You need to talk to your attorney about this situation.
Talk with your lawyer about your options of conversion or dismissal.
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