Notice Period - boss said that i have been confirmed 3 days back however i haven't received any mail

Hello, I am working with a MNC in Chennai. I joined this company last year in Dec and my confirmation is due in 2 days. Yesterday i resigned from the company, but my boss said that i have been confirmed 3 days back however i haven't received any mail or message in regards to confirmation. My concern is in probation period my notice is 15 days and for confirmed employees it is 3 months, i would like to know which notice period would apply in my case. One more info that as per my HRMS software, i am still showed as on probation status and my last date is 25th of this month. Kindly help as i feel they are playing politics with me.

Confirmation is to be officially given to you.
They are playing games and best way out is to put all dates of joining as probationer and when probation should have ended and on what date you have resigned.
Raise the level to HR HoD for clear answer.
Intimation of confirmation not being sent to you is a mistake from company side and you need to stick your stand and give 15 days notice.

hi
Thanks for the reply. However i applied resignation on 11th may and as soon as i put my resignation in tool, i got mail for confirmation. When i applied resignation the date of relieving was 25th may but today when i again checked it has been changed to 5th Aug and notice period is extended to 90 days. The confirmation letter states effectiveness from 12th may and i put down my papers on 11th may. I am worried they will ask me to serve 90 days which is not possible. Please Help.