I am anEnglish graduate, seeking a job in a call center but I get rejected in the voice and ascent (accent?) round? what should I do to [STRIKE]get[/STRIKE] improve[STRIKE]ment[/STRIKE] in it.
You also need attention to you grammar. You could say the above in perfect British RP, and still not get the job.
The only solution is to improve your overall spoken English. You can do this best by speaking English to a native English-speaking person, concentrating on the type of thing you'd need to say in a call center.