One thing worth considering, if you haven't already done so:
Conversion of BGSO into BGS means you have to pay 15c for each BGSO to receive one BGS share. That makes your cost base for each new share 15c plus whatever the options cost you.
BGS have recently been trading at 30c. Had you paid, say, 20c or more for your options, your new shares would cost you 35c all up, 5c more than current market value. In that example, you'd want to compare a 5c current disadvantage against a 15c definite loss: the options will be worthless if held past their expiry date.
PS: You could also try to contact Commsec and ask if they will initiate the conversion on your behalf. Maybe they're too big to bother with customer service; I'm sure if I rang my broker, she would definitely help.
Regarding a direct call to the company: You can do so even on Monday, which is NOT a Public Holiday here in WA.