A bit of clarification is needed.
If you use under your ospf config -
ospf default-information originate
then OSPF will only advertise a default-route if there is on in the routing table.
If you use -
opsf default-information originate always
then OSPF will advertise a default-route regardless of whether there is a default-route in the routing table.
You say -
we no longer receive the default route but ospf is still originating a defualt route and since the default route is in the routing table BGP
there are a number of confusing things here -
1) if you no longer receive the default-route then there should not be a default-route in the routing table so OSPF should stop advertising
2) you say you no longer receive the default-route but then say it is still in BGP routing table. How can it be if you no longer receive it ?
Jon