Stray Cat littering infront of my door.

Hello. I live in top floor of a co-op housing society. (7th floor) There is a stray cat which is coming infront of my door and littering/urinating. The main problem is, i have indoor cats and because of the stray cat there is high chance of my cat being infected. I wrote a big message to society group explaining the harm it can cause to people of the society, everybody left it on seen and no answer from secretary as well. after few days, the problem remains the same, I called the secretary on his number and asked for a solution. He kept on saying what we can do, members are feeding the stray cat in building premises, I told him to send notice to such members, he agreed on that but didn't send any notice. I also told him to get the cat somewhere far from the society where she can survive and not cause any trouble to members. He agreed on that as well, saying "I will tell watchman to get the cat and leave somewhere far from society" Later, on asking to the watchman, he is saying the the secretary is not giving him some money for auto-rickshaw fare saying that society don't have funds. (Just 100rs) well I can give him the money but the problem is society is not being responsible. I feel like I'm being targeted, and members in the society not raising their voice even though the cat is littering all over the building staircase and corridor, Even though the Cleaner/Sweeper has also raised her voice saying what if she get infected cleaning Potty/susu. No response to her as well. Please help with a solution to take some action against the society Secretary/Chairman.