Hi and welcome.
This is actually a UK forum even though we have many members from all over the world that contribute to the questions and answers. as such I am afraid that it is extremely unlikely that anyone from Gigabyte's management is going to be able to help you here. I would suggest try contacting Gigabyte head office in Taiwan.
What you are saying about people importing the merchandise and then selling it at an inflated figure in Tunisia is standard business practice. Some do expect to make more of a profit than others but it isn't unusual.
Good luck.