Hello @arundevaraj,
Welcome to the community!
Plans that come with the 1000min international minutes are usually a promotion and do expire in a certain time, when a promotion is about to expire Fido would usually notify us on our invoice at least 3 months in advance.
If you check your last 3 invoices and you do not see any notice that it will expire you can contact customer service and they can look into your account and better advise you.
