Same with me and keystone. They told me that I owed taxes from a municipality that I didn't live in. It was a neighboring municipality but we shared zip code.

Show them the previous transcript saying the paperwork is clear from earlier in the year and other times. Keep all records. Keep insisting it's the wrong town, place, etc. Document and produce evidence. Its gonna get old and tiring but it's really all you can do unless you get a lawyer which that's a whole other thing.

Technically under PA law there is no limit on how far back someone like keystone can go back to uncover and demand taxes. (link)