UceProtect have operated this way for a very long time. It upsets a lot of people that are on shared networks like DO. Unfortunately the best you can do is move your commercial email to a paid system such as an email marketing company that deals with email campaigns. An alternate option would be to wait for the block to time out, but that can be weeks assuming the spammers on DO have been stopped. The payment UceProtect accepts is to bypass the timers. It is akin to paying bail, but you should not do it unless you know the spammers have been stopped. The bigger VPS providers such as Amazon and Azure have their own email services you can use. The smaller VPS providers get abused a lot and it takes too long for their teams to respond to the UCE complaints. This is why their AS numbers, CIDR blocks and smaller netblocks get blocked by UceProtect, SpamCop and other RBL/RSL's frequently.