Zero drop rate ib 36 days, how is this possible?

I have problem with drop rate of map "the Covards Trial" it is a last map i need and i tried many methods to get it:
- scarabs
- atlas
- chancing
- kirac ( roled almost 400 times and got all unique maps but not that one i need)
Yet still nothing. It is very strange because i have over 36 days on this character.
Please help me!!