champion bugs

so just curious if the PBE actually does anything, or its just so people think you put thought into each patch and test it. consistently, through many patches I find bugs where i get told my target is invalid (e.g xin zhao's e targeting an enemy (say lee sin as was last game)) my abilities sometimes don't fire because i don't have enough mana apparently, when i actually have at least 2x the cost of the ability(actually had this happen with tryndamere's spin a few times even(no mana but go figure) the vi bug way back when where she couldn't flash with her q charging(as with a few other champs as well), lasted multiple patches before you guys even noticed after all the money I've spent on this game for skins, i just want to know if a red can actually tell me they try to fix this shit or just hope we don't notice because at this point its pathetic if nothing else. so can you tell me when these bugs with abilities may be fixed, because i usually get at least 1 per game, sometimes upwards of 10, and its no longer worth playing the game until i know your actually trying to get rid of these problems, i have been dealing with it since S3 and haven't once seen an improvement.