@Huma0 Ugh. I stopped receiving text alerts completely several years ago, and while the rep did understand what I was talking about, his first suggestion was "Maybe your text inbox is full". I told him that was rather insulting of my intelligence, of course I would have checked that before contacting them. The next suggestion was that it must be an issue with my phone provider. I told him it wasn't- that I got all other SMS messages no problem.
He finally deigned to talk to the tech team, who confirmed it was a a tech issue on their end (surprise surprise) and suddenly, about a month later, the alerts started coming through again.
But I have experienced similar, but not the same, as you- I usually get the alert of the initial request or inquiry, but often don't get subsequent ones, and there can be a time lag of several hours.
That conversation you had with the brain-dead rep is why I message rather than call when I've had issues. I find I can usually write a message, in the clearest, simplest way, as if I were explaining something to a 3 year old, (no paragraphs, short bullet point form, in chronological order of when and how the issue presented itself) and they usually comprehend, although not always the first time.
I also start my messages with a heading- "Tech Issue", "Trust and Safety Issue", so they don't have to decipher what it is I am contacting them about.