opt discrepancy

bought 100,000 opts last month thinking exersize price is 20c how i came up with that information was from
HEG capital structure 20c opt 30/9/09 54,218,158
1/4report 31/10/08 cap/structure opt 30/9/09 e/p 20c
" " 30/1/09 " " " " " 20c
ive now found out the e/p is 25c. has anyone else been been cought like this or have i mist something? spoke to heg about this last week the m/d phillip (comes across as a good bloke) didnt know anything about it.can any one enlighten me.
regard john