Next question (actually 2)
1) what is your speed plan
2) are you in a congested area (apartment block, condo, side by side, school).
Regarding questiont 2 the more devices there are the slower the speed will be as everything is competing for the limited bandwidth. Even if your in a single family house having a number of devices on at the same time can cause the same result.
OK we can rule out congestion. I am trying to find a posting here that had a sort of chart that showed the ratio of Wi-Fi to line speed. Off the top of my head though I think that the Wi-Fi speed was about half so if you have a lightning 10 for example then your Wi-Fi speed is the best your going to do.
Best thing to do is like CJ from MTS suggested and call their support desk @ 204-call-mts (204-225-5687) and they can remotely check your line speed to the modem. IF the speed there is within limits of the plan you are probably getting the best Wi-Fi you can. Are you using your own router for Wi-Fi?
Your line is performing right where we expect it to be, based on our Eligibility Calculator. ADSL is the only technology available to you in your part of the Province, and 4 Meg is pretty much the best you will get at your distance from the serving equipment. There is no HSI congestion in your community and the platform is up to date technology (for ADSL).
If you live in a provincial park I think it is safe to assume we aren't talking Winnipeg or Brandon and would be dealing with a rural Internet connection. The download speed would be in the normal range for a rural plan. The upload speed could vary widely.
In terms of WiFi congestion it isn't just apartment blocks, condos, etc. anymore but even single family housing now. WiFi is so popular it is not uncommon to see neighbourhoods where EVER house has at least one network. Living in a provincial park though it is likely this is not part of your issue.