Broke Rental Board - Should I pay?

Hey everyone, I'm just after an opinion.
I was hired a really sketchy soft top board today in Portugal, it had probably around 10 repairs done to it and they didn't look at all professional (though i'm no expert). I was on the board about 30 mins and on one of the occasions I bailed off the board because I didn't make the wave (very small, like 2ft) the thing snapped in two. It was fairly deep water, like waist to chest deep.
I checked the board and it had broken precisely at one of the repairs on the rail. I had signed an agreement to pay 265 euros if a board was broken but I've been out on many rental boards in the UK and Portugal before and never had any doubt about the strength of the board. This one, they really didn't seem keen to rent, it was literally all they had left in their hut, so I took it out of desperation.
When I took the board back the guy kept insisting that I had to pay the full 265 and I argued that a board in that soft of condition (it was a cheapo unbranded thing) was only worth £50 in the UK and that I was willing to pay that but he just wasn't having any of it. He said the minimum he'd take was 130 euros. Eventually I said I'd have to leave a come back with the money. I haven't returned and I can't decide if they are being unfair. I think they are, what's your guys opinions?
I don't understand how weak boards are and how structurally compromised they are once they've had repairs but this one looked in a bad way to me in general, like it didn't have much life left in it. The place where it snapped on the rail was only a small ding, most of the repairs apart from that were on the rails near the front. I'm just trying to work out if they knowingly gave me a board that was very likely to break.
Thanks.
I was hired a really sketchy soft top board today in Portugal, it had probably around 10 repairs done to it and they didn't look at all professional (though i'm no expert). I was on the board about 30 mins and on one of the occasions I bailed off the board because I didn't make the wave (very small, like 2ft) the thing snapped in two. It was fairly deep water, like waist to chest deep.
I checked the board and it had broken precisely at one of the repairs on the rail. I had signed an agreement to pay 265 euros if a board was broken but I've been out on many rental boards in the UK and Portugal before and never had any doubt about the strength of the board. This one, they really didn't seem keen to rent, it was literally all they had left in their hut, so I took it out of desperation.
When I took the board back the guy kept insisting that I had to pay the full 265 and I argued that a board in that soft of condition (it was a cheapo unbranded thing) was only worth £50 in the UK and that I was willing to pay that but he just wasn't having any of it. He said the minimum he'd take was 130 euros. Eventually I said I'd have to leave a come back with the money. I haven't returned and I can't decide if they are being unfair. I think they are, what's your guys opinions?
I don't understand how weak boards are and how structurally compromised they are once they've had repairs but this one looked in a bad way to me in general, like it didn't have much life left in it. The place where it snapped on the rail was only a small ding, most of the repairs apart from that were on the rails near the front. I'm just trying to work out if they knowingly gave me a board that was very likely to break.
Thanks.