With Simplex operation, many stations may or may not be able to reach the Net Control Station.  In this case, you may need to take the initiative and act as a relay station.  You can hear the calling station but Net Control doesn’t respond or acknowledge the transmission.  Copy the calling stations traffic to relay.  Re-enter the net with the proword “Relay” and your call sign”.  Net control will acknowledge your call sign and request your traffic at which time you can relay the message.  In some cases, multiple relays may be necessary.  Speak slowly and use ITU phonetics to avoid having to repeat your traffic multiple times.