I also worked for this school a few years back. Fighting for pay was a monthly occurance, as were the problems getting visas!
Sochi was a great place to live (once I had managed to get them to move me in to town - I was located in the mountains 45 mins from the nearest shop) and I had a ball in my spare time, but it is really not worth the hassle you have trying to get paid! Do not trust these people!