I would not text a prof even if they gave me their cell number. Have you tried calling the number?

Profs should respond to emails, but many have hundreds of students and so can't be expected to reply instantly. If you are worried about him receiving assignments many email apps allow you to request a "receipt" when an email is opened. If he later claims he did not receive the assignment you show him this.

Cancelling two classes in one semester is really not a lot, and I have rarely had a prof make up a missed class unless there were special circumstances.

Does he have office hours? Sounds like it is best to talk to him in person. If he does not have office hours it seems like you have been able to talk to him before/after class.

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