After manging to unscrew the bloody thing it turn out that the filter does NOT fit as it is the wrong filter for the bongo, although on the description says MAZDA BONGO FUEL FILTER T/D 2.5CC 1995 - 2003 NEW !!! and my bongo is 1998 so since I have no experience on the matter I boguth it...well was I wrong or what?
I've wrote to the seller and hopefully he will refund me...wish me luck.

Thing is he as sold 5 of these filters and I was wondering if anyone is in this forum and as had the same problem.
Just thought I share this experience with everybody as the guy as still got some for sale.