Issue with Home Phone since upgrading to Telus PureFibre

I live in a condo and upgraded to Telus PureFibre 10 days ago.  Since upgrading, my home phone goes out of service every few days.  Sometimes I can call out, sometimes I get a fast busy after dialling a number.  People calling in get mixed results - sometimes they get through, sometimes just 3 beeping noises then nothing, sometimes a NIS recording, sometimes a client is not available at this moment so try again later  msg.  I've reported the trouble 3 separate times, each time being on the line for up to an hour with an agent.  Eventually they get the phone working again and say it's all fixed but a few days later it goes down again.  I seem to be going in circles with no real results and am pretty frustrated.  Anyone else had issues like this and/or can anyone offer possible solutions? Honestly, I wish now I had never upgraded - it's not worth the trouble.