Continuous SPAM from certain IP/s hosting provider, how to report them if not responding at [email protected]

last maybe 4 weeks is coming SPAM e-mails from various domains. In common is that when i paste the source code of the e-mail to

https://www.spamcop.net

is detected this provider and their mailbox: [email protected] i have reported this activity to des capital numerous times via spamcop and also manually to info@des...(got no reply) no effect. I would block the sender, but it is from various domains and various mail content, so i do not know how to block in Thunderbird.

When check "From" in one of the e-mail source and check hostname IP, i see "server9.lindhint.info has address 212.193.29.252" whois on that IP:

inetnum:        212.193.28.0 - 212.193.31.255
netname:        Serveri0n
org:            ORG-DCB8-RIPE
country:        NL
admin-c:        AA35882-RIPE
tech-c:         TA7409-RIPE
status:         ASSIGNED PA
mnt-by:         RELCOMGROUP-EXT-MNT
created:        2020-12-02T15:36:18Z
last-modified:  2021-05-11T06:56:00Z
source:         RIPE

organisation:   ORG-DCB8-RIPE
org-name:       Des Capital B.V.
country:        NL
org-type:       LIR
address:        Krammer 8
address:        3232HE
address:        Brielle
address:        NETHERLANDS

Question: can i contact their IP/network provider or some authority that can force them to cease the SPAM, which, how? RIPE claims "There is nothing we can do if a network operator chooses not to reply." I am not from the country of this host.

Update: it came to my attention that "Serveri0n" (mentioned in "netname" whois) have a colocation customer whose customer is likely the SPAMmer. Serveri0n acted quickly to prevent SPAM. Thank you (answers still welcome)