LGD510 mobile
Mobile is not working properly

I brought new handset of LGD510 mobile before 6 months nd it was working properly at

that time but from last 30 days its not working properly and thats why i also went to LG service center but

there also the people over their dont give me proper tretment and also behave rudely with me.

now what should i do? My mobile is also not repaired.please reply and tell me what should i do???