PureFirbe Landline

Approximately one year ago, I migrated all of my Telus Home Services, from copper to fibre.  All is working perfectly, with the exception of my landline.  I have called customer support at least 4 times over the course of the year, and nobody seems to know how to "fix it".  The following things are constantly happening - Can anyone help me please to correct these problems? 1) 95% of the time, I have to redial a number before the call goes thru.  2)  I am sitting beside the phone, but it didn't ring, and a few minutes the voicemail light is flashing - Somebody did call, and left a message.  3)  When trying to place a call, it rings on the other end, but there is "dead air" for up 10 10 or 15 seconds, continually saying hello, then it finally connects.  4)  Accessing voice mail (*98), is a "hit & miss" most of the time - Have to try multiple times to get in to my mailbox.  I've missed a number of important calls, because the phone did not ring.  A solution would be greatly appreciated!  Thanks very much.