I have the same issue. Pending for month, and submitted a few tickets, but the rewards still pending there. Dell really annoyed me.
I have been having a rather frustrating experience with obtaining Dell rewards owed to me.  I have over $140 in "pending" status.  I have been calling Dell since the end of March, opened two cases, and have made multiple phone calls.  Every time I am promised that the rewards will be available in 3-5 business days but that time period comes and goes with no resolution.  I called again today and my request to speak to a supervisor was refused.  I have been a loyal Dell customer my entire life and would like to remain that way, but I'm super frustrated with all this red tape.  Does anyone have any suggestions on how to release the rewards?
Dell Rewards Pending for months