Remarriage Issue

I got my divorce decree from my district family court in November 2016 and waited for 90 days period and re-married in March 2017. In July 2017 I got a court notice from my first wife from high court to dissolve the divorce. I provided my current situation that I remarried after a period of 90 days and never got any notice in that period from high court and after my second marriage nearly I got this notice about 4 months later. My first wife argues in court that my marriage is illegal and she wants to dissolve the divorce which issued by the district court. Could anyone help me or clear this situation. Even the Judge says I need to verified in the high court before going for remarriage. I can't understand this situation. When the blogs and even in the district court, lawyers all suggests that only to wait for a period of 90 days after decree issued and then proceed for remarriage. No body mentioned to verify in high court in that period. Also it was mentioned that she filed the case in the month of January 2017. If that is the case why court issued the notice in July 2017. why such a long time? what will happen in my case?