Your phone line in any case should never be affected by an upgrade process on your DSL. It has happened in the past where mistakes have happened however our hands are limited to get phone service restored. Usually, the problem will be fixed much sooner by contacting your existing provider, which I can see you are making attempts to do so.
I am also sorry to hear about the missed dispatch. If it is currently set for the 5th, that will be the best I can get you.
What I will do is get a hold of Bell to see if we can have them double-check that nothing got pulled as it is ultimately possible that during the process, a mistake was made by the tech. It is also possible that its coincidence and completely unrelated.
I will let you know what the outcome is on my end, but please keep on trying for Bell support. I checked their site and chat is currently disabled but keep an eye out for it.
Director of Service Delivery
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