Need to automate calling and recording voicemails

Looking for a way to get away from manually building cold call lists. The current system in place to build these lists is dial the first number of the trunk line (570-954-3000), wait for the rings, and write down the individuals name. Then I will proceed and move onto 570-954-3001, 570-954-3002, and so on and so forth. Though effective and worth the effort, it is extremely time consuming. I need a way to automate this process. A guy in a different office created a way for his computer to auto-dial at night and record the voicemails. From there, he just listens in the morning and saves time and effort. I'm looking for the same. It should be noted, I am not a computer guy. I don't care how we get to the finish line, I am just looking to cost effectively automate this process. I'm not looking for bells and whistles. At the end of the day, I need a way to come into work in the morning and have voicemails from hundreds of automated calls made overnight. I'm looking for a long-term partner, as if this goes well, we will certainly be looking to make modifications and upgrades. I would be happy to go into more detail if someone has ideas or is interested in tackling this project with me.