You have Shaw's equipment? Unfortunately if you were getting Telus services installed and you've never had the Telus hardware installed at your house, the installer will go to the house. Telus services will not use Shaw lines or hardware. A virtual install just wouldn't be possible if you wanted working service.
If you have Covid, was that clearly communicated to the sales person you spoke with? Why would you state that you feel uncomfortable exposing yourself to Covid when you said at the beginning of your post that you already had it?
The installer likely felt that entering a residence with a Covid positive individual, and a reactive dog, was too much of a risk. As for cancelling the "deal", that's something you'd have to discuss with Telus directly in regards to why.
ESL? Is that a company or a reference to something else?