I believe part of the fine print to the promo was that you needed to port in a number. Once you get the temporary number you have 30 days to port in.
There have been a number of complaints about the app timing out. Contact chat through the website and not the app. Better yet it might be faster to use Facebook messenger and send them a message that way. You can find the link by clicking the box with the "f" in it at the bottom righthand corner of this page.
