1. You will not have to contact the GM once you put in the spend credit.
2. Sometimes the GM has to review the ticket once again to recover your items to find out exactly where they are at and confiscate them all before giving them to you. This may take a little time, give or take, but normally it doesn't take longer than 5 days at most, and that's talking about the extremest of extreme recovery cases.
3. If you've closed the ticket and sent in the request it will not matter. Remember to note the ticket in your request so that the GM may look it up for reference. If they see the request, they will look up the ticket, that's why the ticket # is needed.
4. The worst that may happen is that there's delays such as the GM in question working on other projects. Knowing Isuzu, this is the case, she's constantly working on projects for the server

Hope that helps! ^^