A Telus guy just installed a T3200M modem for my 150/150 plan. I have a newer laptop with Intel(R) Dual Band Wireless-AC 3160 that can only connect to the 2.4G because the 5G is invisible. It takes minutes to load a single internet page on both my cellphone and my laptop. It says it's loading and once it's done there is just a white internet page, and the images and the rest follow a few minutes later. I cant even run a speed test because the page freezes/stops loading. I have reset the modem both by unplugging it for 30sec and by factory resetting it with the reset button at the back. I have restarted my computer and turned off wifi etc. When I plug in the Ethernet cable and change to Ethernet settings there isn't any difference in connection performance. I just opened task manager and looked at the wifi throughput and I dont receive any more than 120kbps. Its an 802.11n connection type and I dont have a router. I even tried changing the network channel to 11 but no change.
That is not the experience I had with my T3200M, though there were a few other issues about interconnectivity of devices on my home network.
You should be seeing close to the speeds you purchased with the T3200M. I found it faster than the T1200H I was using previously.
Let's see if a few more jump in, before you contact Telus directly for further troubleshooting.