Clueful BGP Engineers

Can someone with a clue from the following two carriers please contact me off list? XO - ASN 2828 Level 3 - ASN 3356 I am currently experiencing a UDP/DNS DOS originating from 165.194.27.159 in Aisia. We have attempted to blackhole the subnet using BGP communities, but the requests are being filtered out at the X/O and L3 interfaces.