facebook retroactively disapprove ads all the time. especially ones that are working fine. make sure your ads have conservative images in them and are in on the TOS to the t.
as for the billing i had the same issue i thought i was getting a free day but they banged me with the charge today. damnit. that would have doubled my ROI!
as for the billing i had the same issue i thought i was getting a free day but they banged me with the charge today. damnit. that would have doubled my ROI!