Ryanair duplicated my surname onto my partners ticket, support demands €115, flight in 3 days

Hi everyone,

I booked a Ryanair flight for my partner and myself (departure in 3 days). During the booking process, we are almost certain that we entered her correct surname (J), however the booking confirmation shows my surname (S) instead of hers.

It appears her surname was overwritten/duplicated in the system with my surname.

We contacted Ryanair support multiple times (chat + agent), but they insist this is a standard name change and want to charge a €115 fee. We explained that this is not a voluntary name change but must be a system/data entry error, but they refuse to investigate further without charging.

At this point we are stuck, because:
Flight is in 3 days, support says no correction without fee and we are unsure whether we can escalate this further or if we are forced to pay

Has anyone here experienced something similar?

Should we just show up at the airport counter 3 hours early and ask if they can help us? Do the gate agents have more common sense, or will they charge me as well?

Any help would be really appreciated. Thanks!