Switched to Koodo today from Public Mobile. Set up my voicemail (it seemed; I followed the simple instructions from Koodo) and just now I had a friend call me to test out my voicemail. After about 7 rings, my phone stopped ringing and I figured voicemail had picked up. However, my friend informed me that some stranger had answered his call. Instead of getting my voicemail system, my friend had his call transferred to an unknown person/number! What.
Other info: I have an iPhone 7. Post-paid plan. Earlier today I tried to set the time/number of rings before voicemail kicks in (using info I found in these forums). It seems I screwed up. The advice I followed is this:

It, um, probably did not work. Now I don’t know how to get my voicemail “back”. Anyone out there know how to fix this? Please help? Pretty please?