Attacks from poneytelecom.eu

Hi All, Lately we have seen a lot of attacks from IPs where the PTR record ends in poneytelecom.eu to PBX systems. A quick search on twitter ( https://twitter.com/hashtag/poneytelecom) shows multiple people complaining that they reported the IP's yet nothing happens. Has anyone had the pleasure of dealing with them and have you gotten anywhere? I wonder if the only option is public shaming. I would rather not ban their AS as it may hurt legit traffic but I am out of ideas at this point.... TIA. Dovid