shit happens. There are unwinnable games even in diamond lol. What's important is that you don't let these kind of games influence your mentality coming to the next games. Trust me if you're consistent enough and continue to do your best regardless of the shitty situations you will climb. Your team only have 4 chances to have bad players while enemy team have 5, you will always end up to your elo eventually.

Remember what decides good players over the bad is consistency. Not just being good or better in singular games. I have friends who claimed they deserve higher elo because he solokilled someone above their elo in one game. But is that really the case? it's not hard to overperform someone over one game. Hell even Faker can be solokilled by Gold IV Brand. If you think these unlucky games prevent you from climbing, then you have the wrong mindset. Better players will always have more good games to outweigh their unlucky ones.