Possible CSC failure. NEED ADVICE ASAP

Inspector71

May 2014. My clutch gets spongy and then goes to the floor. I drove a long way home in 3rd gear, no choice. I have it towed. They say the clutch fluid is dirty, change it, and it works. August, same year, same thing and had it towed both times. They bled the system and said air was in the line. September, same year, same story, this time it is the fault of the DOT. I needed GTR DOT, which they put in. Worked again. Late October, started going soft again. Warranty had expired the week before. Sold the car.