If you want to block an intruder from the outside in to your DMZ, you need to adjust your outside ACL, not the DMZ ACL. The ACL above and the way it is applied determines what machines on your DMZ are allowed to out of the DMZ interface.
You are looking at the wrong access control list - attack traffic is most likely coming from the outside, so you need to block attack traffic with an access control entry for the access list applied to the outside interface. In other words, you do not need to modify the ACL applied to the DMZ interface because that's only used to control traffic that is generated by machines in the DMZ, not traffic destined to those machines.
A note about the access list called "ACL_DMZ": that ACL permits all TCP and UDP traffic - the "deny ip host 126.96.36.199 any" and the bottom of the ACL is not really doing anything.
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...