Society maintenance

My husband and I have purchased a flat in 2016, me as the first owner and he as a second owner, which we have rented out. Since the purchase my husband has been paying the society maintenance charges and was a part of the society WhatsApp group. Recently, due to some personal issues we have decided that I am going to look after the flat and it's maintenance. When I reached out to the society secretary to add me in the WhatsApp group to get all the updates, for my suprise he shared the notice only in my name where society maintenance is not paid for last one year and the fine is changed and the total dues has become double the original amount. Though my name is on the notice I never knew about the non payment till I reached out to them. My questions are- 1. should society reach out to both owners, specially first owner in such cases or communicating with one/second owner is sufficient? 2. Can I ask to let go of fine as I wasn't aware of the non payment till date? 3. How much fine the society can change? They are charging rs. 10 per day as late fees