Punjab National Bank [PNB] — e mandate

Address:

Meerut, Uttar Pradesh, 250001

I am investion in mutual funds through groww app. I have today received a message from pnb that my e mandate has been processed. Firstly i have not filled any form for e mandate. I had once talked to groww customer care about mandate and after two weeks they have initiated the manadate without my permission. I haven't signed the mandate also. How it can be done without my permission.