I had been applied for visa change since December...

Sir, we would like to inform you that your question does not relate to our field of work as legal consultants in the legal section. Knowing that, this section specializes in providing consultations to our respected clients. Keep in mind that Jawabkom website has no dealings with any government party
** But regarding what is mentioned in your inquiry and regarding changing the visa, it needs a period of sixty days to obtain it. Immigration and residency can be reviewed if its extraction exceeds this period to find out the reasons for the delay