This worked for me too, Op make sure you have them refresh your line. They did it for me last night and iMessage only started working today. I had no sms for 6 days I figured they would fix the issue without notifying them as it has been happening to...
I called in the other day and I was able to listen into the reps call telling the customer what plan they were getting. He could not hear me and I couldn’t hear the customer. I didn’t even get the automated recording