1. Have you asked the secretary for what particular purpose he is demanding 50k from each owner
2. Also is a resolution passed with majority vote that the above amount has to be charged from each owner?
3. The secretary cannot unilaterally impose any amount and require it to be paid by the flat owners
4. A proper meeting of flat owners and managing committee needs to be called and this issue has to be discussed and a proper resolution has to be passed for giving effect to the demand on each flat owner for such a big sum
5. If there is no proper resolution by the managing board approved by majority flat owners and also no particular agenda as to how the amount of 50k is to be utilized and for what purpose, you can refuse to pay the same