The router that they gave me doesn't read a SIM card and it doesn't have network, I tried calling the call centre but never got an agent to help me, I sent an email but never got a reply or help that I need

The router that they gave me doesn't read a SIM card and it doesn't have network, I tried calling the call centre but never got an agent to help me, I sent an email but never got a reply or help that I need. Since today I haven't used the router