According to your suggestion i sent the message below to the embassy of Canada in Tunis, hoping that they accelerate the process of Visa treatment before the date of my departure to Outaouais which is 25 May 2019.
Dear Sir/Madam,
I'm Fayçal BEN BRAHIM Director in the ministry of vocational training and employment in Tunisia and Phd Student in Faculté des sciences humaines et sociales de Tunis and University Nice Sophia Antipolis in France. I have to give a communication in the international congress of ACFAS in Outaouais in 27 May 2019.
So, I submitted my visa application in the tunisian Visa centre on 18 April 2019 and I didn't receive my visa until now. After the date of submission, the university of Tunis has given me the allowance (1500 Tunisian dinars) to cover the expenditures in Canada, so i think that this information could accelerate the process of visa traitement. When i have gone to the visa centre, they said to me that they can't accept any additional document after sending the application to the embassy.
By the Forum of Canada immigration, i take the recommendation to send you (attached to this mail) the "Attestation de prise en charge" and the "Ordre de Mission" hoping accelerate the obtention of my Visa.
In advance, my all thanks and best regards.
Fayçal BEN BRAHIM