It is possible that your emails to your uplines never reached them.
I read somewhere that at least one sponsor sends out emails to his downline using 3 different email addresses, in the hope that the email filters will let at least one of them thru.
If you can find alternative email addresses for your upline, and send them from 3 different email addresses that increases the chances of one of them making it thru (have a PS explaining why you are doing this).
Or maybe you have a phone number for one of your upline.
Other sources of information is this forum and the GDI support team.
This opportunity in my humble opinion is excellent as it it ticks a lot of boxes. I wouldn't let anything stand in my way. There is usually more than one way to achieve your goals.
Best,
David