I faced such situation in past but i had a different case and i surrendered the domain to them but you have advantage as the domain history exist prior to brand. They should do a deal with you, i dont think they can just take it away
I have faced the same in the past. However I actually infringed upon someone's trademark on purpose. However this clearly isn't the case. This is a case of a sad pathetic desperate chancer trying his luck at thieving my brand.