well, i asked cos it doesn't make much sense apply for a visa NOW if you're planning to travel much later. i suffered same issue last time i was to go to London, hence it's advisable to apply at about the time you're ready to travel.

But seems your case was due to miss information (who said it was valid for 3months). Nevertheless, are you SURE you can't make it down here before it expires? if you're sure, then return to the embassy to find out what to do. Normally, if you haven't traveled after it expires, you will have to re-apply, unfortunately.

how long is it valid for? back then, i remember it was valid for 3months. if it's valid for 1month, then you have to travel BEFORE it expires.

if you're not ready to come, then why apply for the visa NOW?