Engine mountings on megane 1.6 07 model

Hi new on here so dont know if theres a thread already i have a one owner 2007 megane extreme 1.6 its like new then i noticed as i was rolling slowly in first in traffic just lightly slowing and picking up in first and i noticed forward movement with accelerator down and backward with easing off, the gearstick i mean. I find it annoying so the garage said its the top engine mount and replaced it with a patent one, all was ok for a few weeks then i got stuck on the m25 and it started again so back to garage who then said it was the gearbox stabiliser and they replaced that with a renault part which has not worked it still does it, so know they want to replace the bottom mount!!! what do i do? i asked another mechanic and he say's ita a million to one for all three mounts to go especially on a 30 ,000 miler i am at a loss what to do, do i get the bottom mount done? they say it will at least cut it by half. Any advice really appreciated.