Sikkim Manipal University — didn't get certificate and didn't respond

I finished my mba from sikkim manipal university but i didn't receive by the original certificate. So i contact university by its costumer customer care no they told me that they have the same. Will send me for that need to do a mail to the given mail id. From december 1st itself i done the mail. As the costumer care word that will replay with 48 hrs. But didn't get any replay. Agin i tried customer care they told me didn't receive the mail. I done the mail and confirmed the mail is received. But i am still waiting no response from the other end. I have no much time to wait because this is for about my job.