First step should be to contact DigitalOcean support and they should help you sort this out ASAP. If they don't then update your DNS registrar to someone else e

First step should be to contact DigitalOcean support and they should help you sort this out ASAP. If they don't then update your DNS registrar to someone else entirely. I had a job almost 20 years ago at a dedicated web hosting company and it was almost a daily occurrence for someone to try to utilize an IP address or domain that they didn't own. Some of the more bold ones would even try to use social engineering to get someone on a support team(usually over the phone but not always) to create sub-domain entries for domains they didn't own or even change A records to CNAME to redirect the entire domain to some fraudulent website. The company had control over a Class A and multiple Class B IP ranges and it was also very common for existing customers to try to "borrow"(to avoid being charged for it) the use of additional public facing IP addresses that were not actively in use at the time.