Saying, asking, telling are verbal mode of communication and d difficult to prove.
If you have acknowledged and approved copy of leave then it might have helped to claim deemed extension of contract.
Even then the employer could have terminated it with notice/with notice pay in lieu of notice period.
Obtain clean relieving and firm up your next employment.
If you have rapport with Managers/employer they may agree to give you service certificate/salary certificate even for a later date.
Try for it.