Dell order cancelled with no reason

I ordered a Dell XPS 15 7390 at a sale price on 1st July. The order was paid by Paypal and went through no problem. Now, for no reason whatsoever the order was cancelled today 3rd July. Normally I would just place another order but the special price has now gone. I can't help but think they did this just to stop me getting the special sale price. I have emailed them to ask for the order to be reinstated and that I be charged the original price I paid instead of the new higher price. Pretty bad service so far but let's see if they sort it out.