Pune Traffic Police — wrong behaviour of traffic police

Address:

Pune, Maharashtra, 411042

On 22/01/2019, I was coming from chakan to pune. At khadki chowk, police officer asked me to take my bike to the side of road. He told me that there is a pending challan (driving without helmet) on my bike. He said "you have to pay that challan right now or I will collect your license". He didn't give me any receipt after taking my license. It is was cctv footage taken on 03/05/2018 at bibvewadi chowk, pune. The offense 129/177 mva comes under highway police. And bibvewadi comes under city police. The main thing is that there was no compulsion for using helmet while driving bike in city area. The use of helmet made compulsory from 1st jan 2019. How can they behave like this. This is really ridiculous.
I think RTO commissoner should think about this. How can they charge for previous year when use of helmet wasn't compulsory.