Dynamic IP addresses are blacklisted

Over several months, I've experienced a recurring problem with Voxtelecom: the dynamic assigned IP addresses for my fibre connection are blacklisted. This is not as a result of anything I'm doing. They tell it is due to other users abusing the service, which gets the IP blacklisted, and then the IP address is dynamically assigned to my connection the next time I reconnect. This has a negative impact on my personal and business communications. It is frustrating, as the router can be rebooted several times to obtain a new IP address, but the assigned address is NEVER 'clean'. The technical support at Voxtelecom basically explain why this happens but cannot offer how they ensure assigned IP addresses are whitelisted.