So BIL GF fridge broke just before Xmas so partner lent her £500 for the fridge she wanted on the basis she pays back £40 every month. The first 2 months were a nightmare to get money from her and now my BIL and his GF have broke up. He tried calling her a few days ago with no answer so messaged her reminding her that she has to pay for this month. She ignored it for a few days so I messaged her today and she replied saying she can't afford it so we can take the fridge back. No problem, we could do with a new fridge anyway as ours was second hand when we got it. Got someone to come and help us collect it and she's ignoring all our calls and texts. Her mum then phoned me shouting abuse down the phone to me and my partner and we explained that we just want this sorted. She either pays us as agreed or she lets us come and collect it. She hangs up and has either turned her phone off or blocked our numbers. We went to ex GF house and no one is in and can't get hold of either of them. I messaged again tonight explaining that I can get someone to collect it tomorrow but if that's not convenient she'll have to bring it to us as they can't do it any other day.
I'm obviously fuming now because we helped her out when she was in need, but is now doing this. What can we do next? I don't want to keep calling/texting but I'm worried that she's going to keep ignoring us and we'll be out of pocket and won't even have the fridge! If she had replied asking for more time to pay etc then that wouldn't have been a problem, but the fact that she is ignoring us makes me think she's going to avoid us and keep it. Is this a case for a small claims court or would that cost more than it's worth?
TIA