SES IP is blacklisted

Hello,

For several days many of our e-mails are bounced back with reason:

Reporting-MTA: dns; a4-17.smtp-out.eu-west-1.amazonses.com

Action: failed
Final-Recipient: rfc822; user@domain
Diagnostic-Code: smtp; 554 5.7.1 Service unavailable; Client host [54.240.4.17] blocked using b.barracudacentral.org; http://www.barracudanetworks.com/reputation/?pr=1&ip=54.240.4.17
Status: 5.7.1

Basically, that means that AWS blocks sending of the emails because your own IP is blacklisted :)

This IP is indeed blacklisted in many databases: https://multirbl.valli.org/lookup/54.240.4.17.html

I understand that the correct solution is migrating to a dedicated IP, but we send very few mails to justify the cost.

I saw an answer here https://forums.aws.amazon.com/thread.jspa?messageID=1002220#1002220 that "We actively monitor DNSBLs that could impact delivery across the entire Amazon SES service"

But 4 days later nothing changed.

Do you think that a better solution will be:

1. Until removing the IP from the DNSBLs - blacklisted IP to be removed from the SES pool?
2. To have a system to receive complaints from users about these records, currently, I cannot report this situation to the AWS staff. (already tried to raise a ticket)?

Thank you