1. what do you mean by this sentence below?
"How can answer " politly" some one said: あら 違うんだ。"
2. あら 違うんだ means "oh, it's different/wrong"
only girls use "あら" , so be aware of that if you don't want to be mistaken as a gay.
3." Sorry for being late, my Japanese is not good . so I need to ask , and looking to find a good response in order not to reply wrong "
Here it goes:
返事が遅くなってすみません。
自分日本語が下手なんで変な返事をしなくために、色々聞いたり探したりしました。