Servicer cancelled my SAVE forbearance due to a clerical error and won’t reinstate it

My loans are on SAVE. In December I received a document saying my IDR application was denied. I had not applied, so I called. They said it was an automatic recertification that was nullified by the moratorium on SAVE applications, but that I was still on a SAVE plan. They advised me to switch from SAVE to another IDR, but I decided to stick out the legal proceedings. I now learned that they rescinded my SAVE forbearance even though I am still on SAVE in their system. They refuse to reinstate my forbearance, which would be valid for quite a while still otherwise.

A representative spoke to their manager but the manager refuses to reinstate the forbearance, which they say was dropped due to a 15-month old IDR application that was never determined until December—the random document I received with no context after the SAVE settlement announcement.

I am still on SAVE, I told them in December I wanted to ride out SAVE, they are perplexed as to why it took them 15 months to reply to my old IDR application from 2024. They confirmed I am still on SAVE and they refuse to reinstate the forbearance they removed in December because of this 15-month late determination that was the result of MISSING CHECKBOXES on the form in 2024–which is also NOT how they explained to document this past December.

Now I have loans due that I was not expecting, while unemployed, and they are trying to get me into an IDR rather than restoring my right to forbearance.

I feel like I am being strong armed. Any advice?