Did you used nitro hack? This is my third day and I didn't get banned. I'm not playing the game as hard as first day anymore. Still farming for money for last update to fight the final boss on B rank.
Drats...its stopped for me 2 times and both times I started from the 1st race, now say have returned to the original game and just framing for cash as my class A car upgraded to the max cannot beat the boss so only option is to buy the next class car in class S which costs 400K and then will cost 500K to fully upgrade...oi vey!