to ask for information about something
連絡してね。
to sever the connection―cut off the communication―(between the two)
連絡をちょうだい。
連絡を通ずる
to establish a connection (with something)
I will get back to you soon.
I will let you know after making inquiries.
連絡を断つ
to sever the connection (between the two―with the other)―cut off the communication (between the two―with the other)
to establish a connection (between the two―with the other)
both contact and communication
連絡ない。