Greece Hellenic Seaways Scam?

I just received a call that my ferry in June is no longer being operated and they are offering a 50% discount to switch me to another time. In order to give me the difference in money back, they are asking for my banking details. That is making me lean towards this being a scam. However, they knew my name, email, and our seats. I told them to call back tomorrow but i’m not sure if this is scammy or not. I have no emails about it being cancelled and my reservation still comes up as good but that could maybe just take more time? Any advice or tips? has this happened to anyone is it legit?