My (35m) Ex-fiancé (30f) Called Off Our Engagement The Day Before The Wedding, And Is Now Threatening Legal Action To Recuperate Costs. What Should I Do?

TL:DR: My fiance called off the wedding, and we set up a payment arrangement to split the debt. Her parents are threatening to sue to recuperate the money they used on the venue, which I didn’t even attend.

So, my ex called off the wedding the day before and completely turned my life upside down. I was devastated for months afterwards, and I’m still very much dealing with the aftermath of it all. Since it was the day before, they didn’t want to cancel the venue and ended up having a family party at the rented out venue instead. I guess they called it an early birthday party. My family and I obviously didn’t go to this party.

After it all happened, my ex and I agreed on a payment plan to settle our debt, I have emails and a schedule of the payments that were made. It was about 20k between the two of us. I had 8k in my credit card, plus I payed an additional 3,800 to her for other expenses/events. I made my last payment on the 3,800 at the beginning of the month and cut contact with her, as I want nothing to do with her/her family.

I have made it abundantly clear that I don’t want to ever speak with her again and that our debts, on my end, are settled. I still have my credit card, and am working towards it now. She has been constantly ignoring that boundary and has been emailing me, calling me from unknown numbers, and leaving voicemail messages. She says she made a mistake and just wanted to give us more time…but that isn’t how real life works. She is blocked on everything (Gmail sends blocked contact emails to spam…which doesn’t help). I’m legitimately scared that she will show up at my parent’s house one day (after the breakup, I had to move back with my parents). I’ve definitely lost sleep about the situation and find myself being way more anxious because of all of this.

Anyway, I got an email in my spam from my ex today labeled as urgent. Apparently, they (her and her parents) are under financial stress because of the fancy birthday party and her parents are threatening legal action against me if I don’t pay more money. I’m not sure what the deal is, but I’m assuming that the parents added some of their savings that they had to pay for some of the wedding events. I never asked for money from them, I’m not sure if my ex did, whatever the case may be they wanted to give money towards the wedding. I’m not sure why they are coming at me for anything. They had their party, which I didn’t even want in the first place.

Is this something that I need to be worried about? What can I actually be sued for in this situation? Should I get a restraining order against them? I’m going to call a lawyer in the morning and go over this case…but I just wanted to lay it all out there. The stress and anxiety from these last six months is really taking a toll on my mental/physical health and I just want to move on. Sorry for the long post, and thanks for reading.