Trending @Infosys; Possibility of 5 days notice period reduction

My lwd is 23rd July and new org date of joining is 21st July. Asked manager and unit head to reduce it to 18th as 19&20 are weekends. They agreed over a call that they will manage. However in system it still showing 23rd. I’m having fear of loosing both if they didn’t change my lwd. Any suggestions are welcomed.