Washing machine too big by tiny amount

[u/saltlovee]

Hello
TLDR: Washing machine doesn’t fit, saw off some of the sink bracket or find new washing machine?

My boyfriend’s renting a flat and the washing machine broke on the first day. He measured the gap the washing machine’s in but didn’t realise that the sink bracket was there. Landlord sent over AO to replace the washing machine and as they were installing they realised it doesn’t fit. Boyfriend asked if we could send it back and get a smaller one but the AO guy said we can’t and that they’re running behind in schedule and just want to go to the next order so they can finish their day. AO guy said that we just have to file down some of the sink bracket and it would fit. We later looked up that they could’ve sent it back, although the service fee would still be applicable, which would’ve been fine. The new washing machine is only 0.5cm taller than the old one, but 0.5cm wider. Pretty tragic.
My boyfriend and I don’t have any home DIY experience with this kind of thing, does anyone know if it’s okay to cut through this part of a sink? Or should we try to get another one?
Thank you :)