You should be able to rely on tech support to resolve on their own, but it does not hurt to do some research (your posting here) as well as some tests. Try running internet speed tests (wired and wifi) to confirm you are getting the speeds you contracted for, and to determine if this is contributing to your issues. If you have a baseline when things seem normal, try running another speed tests when you are having issues. This information could be helpful.
I cant comment, not being there, as to how good of a job those guys did. you could have 100 techs out, but if they are all doing a poor job.
Are the signal levels, after all the work they did, good to the modem? (if you would like help in how to log in and get them, which you can post here and we can tell you if they are or not) If everything has been replaced and the signal still poor.. it might be an even bigger issue.. going beyond the house. Where they need to get maintenance involved to check the local nodes.. or even further down the line.
With the pods, you have tested to see that you are getting a decent wifi speeds in those areas? Putting them in is great.. assuming they are set up properly.
Not blaming the techs.. but seems like 1/2 of them come in and either dont care, rush through, or dont know enough, to do a good, proper job.
Beyond that.. could very much be a back end issue in that area, which is 200% rogers job to fix.
But just saying overall. With a GOOD setup, with things installed properly, with the back end wherever someone is working fine.. There SHOULDNT be those issues. They dont effect everyone. I have the 500mbps package. I do speed tests 2-3 times a week, and almost always am getting over the 500 (on wired). I have the modem, and 3 pods. Wireless around the house, generally only can max a speed test, at around 150, but still more than enough. we watch a lot of TV and netflix, often simultaneously, in the same room (my son on his computer/tablet), with I would say a min 6 other devices running/streaming/playing something, off that same wifi pod, with no issues on the TV side at all (live or playback). All in all, i have over 100 internet connected devices in my house.