I would like to file a civil law suit for...

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It should be noted that after reviewing your inquiry and legal scrutiny we would like to provide you with the following
If such information is slur and defame, then he/she must report to the cybercrime police to take necessary action against that person
with all evidence that proof the validity of the complaint against that person, including the publications that he publishes, plus information about this person to make it easy for the police

 if you have any written evidences or witnesses for that, then you can file a report against your colleagues for defame and insult, and you can attach these evidences or the witnesses statements. Then they will investigate about that and if it was proved they will be punished according to the Qatari Penal Code as below article state:

Article (326)

One is convicted to no more than two years and to a fine of no more than ten thousand riyals, or to one of these two penalties in case of defaming someone in public through accusing them of doing a mishap necessitating a legal punishment or inflicting their dignity or honor or exposing them to people’s disdain and malice.

Article (327)

One is convicted to no more than three years in prison and to a fine of no more than twenty thousand riyals or to one of these two penalties in case of defaming a public employee due to the job or the occupation, or if the calumny inflicts the family’s reputation.

Article (329)

One is convicted to no more than a year in prison and to a fine of no more than five thousand riyals, or to one of these two penalties in case of cursing a third party in public through addressing improper words affecting their honour and dignity.

Article (330)

One is convicted to no more than three months in prison and to a fine of no more than a thousand riyals, or to one of these two penalties in case of defaming or insulting the victim face to face and not publicly, or through the phone, or a written letter, or in another indirect way.