Help!!! Invoices Not Invoicing in Correct Period

We recently ran our first batch of invoices (via bill sales orders) and, unfortunately had to delete them all (individually, because we cannot get any assistance from anyone at NetSuite!) because of address issues.  Problem is now that a few of them will not reinvoice as they seem to think they've already invoiced for this period even though we haven't.  The only way we can get them to bill is by going to the next billing period that they would bill and then two billing periods will show up on that invoice.  Does anyone know of a way to reset