Chandigarh University — I'm complaining about not getting response from University.

I am bhanuj pursuing BCA(Online degree) and i am in 1st semester. As it's nearly about 10 days since i am trying to get a solution to access my examslot registration, for that i send text messages to some o[censored]niversitie's employees but they are continuously leaving my message on seen. They don't even answer my call. All they say is just send me your email and we'll figure it out. Still they don't do anything. I have my exam on 21st january, 2023. But they are ingoring me i dont why. But i want to complain against them. Take strict action against them.
Here are some employees contact no. I am taking about.

Mr. Arun: [protected]

Mr. Suraj Mittal: [protected]

Thanks.