Divorce Decree Absolute

Hello All,
I married in Hammam Chatt in 2012, my now ex husband divorced me a year later. I have always been in the UK and he always resided in Tunisia, he has since remarried.
I received two letters in Arabic during 2013-2014, which I have since been told was a petition for divorce and invitation to attend court.
I require a decree absolute or Tunisian equivalent, a copy of his birth marriage certificate will not do.
Can anyone advise if there is a reputable person I can contact from the UK, to obtain the relevant document and provide an official translated copy please?

Huge Thanks