Can you please tell me the manufacture recommendation for spark plug change and transmission check for a VW cc sport. After how many miles does this need to be checked?

What is your question?

My transmission is out and they are denying our lifetime power train warranty due to maintenance upkeep. I need to know if I got the car at 58,000 mile on it and have put 38,000 on it when should I have the spark plugs changed and the transmission checked? I need reliable manufacture recommendations.