Blackmail by Society chairman

We had applied for Mortage loan NOC from Society .But Chairman used harsh anguage on phone and told us (on phone) to complete pending plumbing work of our flat first then we will get NOC . Since Lockdown is going on, we cant invite plumber to our home as my aged mother can get infected with covid but chairman didnt listen . so we told him through text message that we will lodge police complaint against him as a chairman of society for forcing us to break lockdown rules to give NOC..which he had shared in society whatsapp group . Immediately meeting was called by few society member and we have been informed after 3-4 hrs that chairman has resigned and comitte has been dissolved ..Now can we put complaint against him (even if he is no more society chairman) for blackmailing us and indirectly putting pressure on us to break lockdown rule i.e not to invite external person home . Few Society members are clealry trying to save him by dissolving xommite within 1 hrs of the incidence Kindly Guide how to go about it.. Thanks in advance!!!