@varkey U can opt out of the auto renewal now ,ur current prime membership will not be affected in any way it will end as the date mentioned their site ,by opting out u will no longer be auto renewed for the prime membership. I suggest u to do as soon as possible altough bsnl said In their site they will inform prior to 3 days as SMS for auto renewal but they didn't bother, that's why I I forgotten to opt out
.