Can I sue defamation for wrong information published in WhatsApp group?

Hi Experts, I am living in an apartment from February 2015, as a leaseholder. Here the association people's collected maintenance charges for the monthly maintenance and am also paid till March 2018. In April 2018 I had found that the CCTV was not working in our floor and security person also do not done his job promptly, so I had complaint this issues to the secretary of the association. He did not taken care on this issues, so I did not pay the maintenance charges from April 2018 to August 2018. In August 2018, the members meeting was held, in that meeting I told this issues in front of members and we decided to change the office bearers. Now new secretary had appointed and CCTV also serviced. I'm continuing to pay the maintenance charges from September 2018. Meanwhile secretary of the association also changed. Now the new secretary asking about the balances in association WhatsApp group. In that I'm replying as I'm not satisfied with the services at that period so I can't pay. He replied as you are living in other people's money and also its shame for you. And also compared me with other members profession also. After all that chating he ask sorry and quit from the group. Can I sue defamation for this instance? I have all the WhatsApp chating details. Thanks for your valuable advice.