Ola Cabs / Ani Technologies — ola fraud on my account

I received a call from +91-[protected] in the morning saying it was from ola kyc dept.
He verified my email and mobile number and then asked for otp.
I asked why he needed the otp, from where he was calling and he said he is calling form ola kyc dept, and so i gave him my otp.

After this i got a message of transaction for rs.8502 on "nandabavesh tours and travels" using my ola postpaid money in my account.
I immediately called ola customer care and they informed that with the number i was calling, there is no account at all.
How could my account disappear from ola database since i have been using it from very many months now, unless its internal ola personnel who did this?

Now i have a transaction of 8502 on an account that does not exist anymore.
Pfa the mails showing the transaction, which was not done by me; change in my account related mobile number and email change.

I need clarification as to how my details regarding my account and postpaid balance is known to whoever called???
I need clarification and verification on this fraud transaction.

I ahve filed a complaint in ola[protected]