This may be why your jungler is not ganking to help you while you lose lane.
I've had too many games where the laner is either tilted or furious that their team's jungler isn't helping them catch back up by ganking. They think that if they can just get a gank, they might be able to get that lead they need to turn the tide and win the lane for their team.
Well yes, that is possible. But from a junglers standpoint, a terrible idea.
Let's say top is two kills down. Mid is even. Bot is a kill up. From a jungler's standpoint, mid is holding their own, bot has shown they can out play their lane, and top seems to be losing a 1v1. A gank top might help them get back to even ground, but in the end that would mean every lane would be about even, with a slight chance bot might be ahead. If the enemy team has a better team comp or late game, this is a shit idea.
Now, if the jungler ganks bot, it's almost guaranteed that they will snowball. Now, you have one person behind, one doing ok, and one (or two counting support) ahead. If the person behind builds tank, this means you have the advantage.
TL;DR It's usually more beneficial, especially in low ELO, to try to put one lane ahead to carry than scramble around trying to help losing lanes.
Edit: A lot of you are saying things along the lines of "but in this situation you wouldn't", or, "If it's this champ matchup gank them". Yes. I realize you don't follow this post blindly into a game and never gank a lane who dies. There are a lot more things to being a jungler. I just wanted to point out this specific case.
its worth going top. these champions have the ability to near instantly marksmen and mages so its worth it to make sure they dont ruin your winning lanes.