Major clutch problems please help nissan is clueless

[mr37]

About a year and a few months ago I was at a beach here in nyc my clutch went out I wasn't able to change gears it was sinking and sinking quick till I could even put in in a gear. I had it towed to nissan they ended up saying my clutch was burned out after giving me crap for a month about how i race the car they finally replaced my clutch at no cost and everything was fine untill yesterday my clutch pedal went to the floor again. Very much drivable but a pain in the a** to drive. I have to pick it up with my feet each time it doesn't seem burned out though. I'm thinking its the CSC. So the tech bled out the clutch fluid and replaced it with GTR fluid. I took the car home yesterday and on my way home it starts sticking again and again I have to bring it up with my foot. The tech says he doesn't feel anything wrong and states the bulletin regarding the GTR fluid so now he's stuck and says he doesn't know what to do because they never had this problem. They say I'm the only one thats feeling it but another tech that backed it out said the same thing. I told him the information regarding the CSC failure but he says he cant go on what I have on my ipad so I have no clue what my next move is I really miss my car.