I didn't know I had a right to grieve it if I'm not a full time driver yet? The steward was in there when they told me and they were very straight forward that I was dq'd and this was how it was and I would be able to drive through this week and peak.
Sounds like shenanigans to me. Depending on your supplement or local contract, driving during peak may or may not count towards your qualification days. In my area, as long as you started qualifying before peak, you can continue to do so during peak. I think if they tried this here, and you continued driving, at day 31 you would be qualified. They wouldn't be able to tell you that you aren't qualified, but they want you to keep driving.
Talk to your BA, but I would keep driving and keep an eye on your pay rate. If they keep paying you like you are qualifying, and not full rate or seasonal rate, then that could bolster a case to grieve them trying to send you back to preload. Also, if they keep you on the same route, that would be good for your case.