Indian Railways — excess platform ticket

Address:

560009

I came to bangalore majestic railway station to drop my mother as she was travelling alone.
Me and my dad hadn't taken the platform ticket which is wrong i agree.

While coming out we were asked about the platform ticket which we didn't have and he said we have to pay fine which we readily agreed.
On asking how much he said it is 310 per person which i refused to believe and he started talking brashly and shouting.

Others who passed by weren't asked. We got a receipt of excess fare and not the fine receipt.