Dell order on hold - Getting multiple different reasons why

I received the following email last night from Dell:

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This email is in regards to your order “”. Your order is on hold due to wrong shipping method which was selected while placing the order. 

As you have provided FPO address, the order needs to be processed with “Parcel Post” shipping method. However, the shipping method selected was “Standard delivery”.

We can send you a new quote which you can use to place the order online. However, the quote is valid only for half an hour. Kindly provide the best time to send a new quote.
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I contacted another department in dell (that deals with OCONUS FPO Shipping) and was told that indeed my order was placed on hold, but didn't understand why as the shipping method was set to Parcel Post already. I then contacted Dell sales support and he said my order was on hold and again told me I would have to cancel it and replace the order. I can't get any reason why and he assured me everything would be the same.

The problem I have is when I placed the order over the weekend I used the 15% cash back link and if I cancel the order and place it again I am going to lose this cash back. The cashback is the entire reason I made the purchase and without it I wouldn't want to even continue with the purchase.  

Are there any reps that can help me out with this? 

Thank You