What time is it? Watches and horology

Some advice from the hive mind sought.

I bought this as a present for my better half at the end of December:

I gave it a bit of a wind when I first got it, wore it in the office, and it kept good time. I couldn’t wear it that long, so I didn’t know how good the reserve was. I gifted it this weekend, and it’s turned out the power reserve only lasted 3-5hrs and that the crown wasn’t well fitted (and I’ve now lost the crown).

I took it to Asal to see what he thought. It needs a number of parts replacing. As it’s a present for someone he took pity and is seeing if he can source the parts and has agreed not to charge if he can’t. He has estimated the cost at £250.

My question is what to do?

Do I start by messaging the seller, or can I open a dispute?

I assume the seller will either say it’s not his problem, or ask me to send the watch back. Given the low purchase price, I can’t see the seller agreeing to footing a £250 bill or refunding all the money. I don’t really want to send the watch back as it’s now been gifted.

On the other hand, if it can be fixed for £250 it is still roughly within my original budget for the present. Then once fixed it should continue to work. If I send it back, get a refund and try and find something else, I’m still going to have to budget for getting the replacement serviced anyway, aren’t I?

Thoughts? Advice? What would you do?