Requesting Marriage Certificate from San Cataldo

[ppulvino1]

Hello! I'm in the process of applying for dual citizenship and need some advice. I requested my grandparents' marriage certificate in 2016 through an Italian dual citizenship website and received it after about 9 months. Unfortunately, the certificate listed my grandfather's birthdate as 1980 instead of 1880 (my grandparents were married in 1909)! So, I requested the certificate again in November 2018 but now time is running short....my appointment with the consulate is in August 2019 and this is the last document I need to complete my application. I wrote directly to the commune some months ago and never received a reply. Can anyone advise on next steps? Should I write to the commune again? Or does anyone know of a researcher who could locate and send me the document before August? Thank you.