Why I don't receive text messages?

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Hello, I joined a month ago without a tick for unlimited text messages, since I do not send them, but only receive (from bank, ebay, other websites, etc). When I created a plan, it was stated that incoming SMS is always free. However, on the help page for problems with text messages, the opposite is written (If your plan does not include text messages, it will be impossible for you to send and receive texts on your phone.). Link: https://fizz.ca/en/faq/i-cant-receive-or-send-text-messages
Anyway, I do not receive SMS messages from the websites I need (Banking, eBay, etc). But I got a couple of spam messages.
What I'm doing wrong guys?
P.S.The Short Message Service Center number is added to the messaging app.

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