Complaints about Phone Numbers443-412-####

User called twice about some Genetic Testing company. Called for first name (online databases likely combining all that info now). Told him first time that we do not want the business, that we previously told them not to call, and now to put us on the Do Not Call list. Same person then proceeded to call an hour later. When asked who is calling and in reference to (once again), they then hung up. Attempts to contact the number afterwards resulted in a dead line; it's probably attached to a multiplexer or some other sort of automated dialer, rather than being a legit phone #.